diff --git a/Libraries/LibWeb/CSS/Interpolation.cpp b/Libraries/LibWeb/CSS/Interpolation.cpp
index 5ddcee94a9a..15c7756f6a0 100644
--- a/Libraries/LibWeb/CSS/Interpolation.cpp
+++ b/Libraries/LibWeb/CSS/Interpolation.cpp
@@ -1220,6 +1220,16 @@ static RefPtr<StyleValue const> interpolate_value_impl(DOM::Element& element, Ca
                     return {};
                 return Inset { *interpolated_inset_box };
             },
+            [&](Xywh const& from_xywh) -> Optional<BasicShape> {
+                auto& to_xywh = to_shape.get<Xywh>();
+                auto interpolated_x = interpolate_length_percentage(calculation_context, from_xywh.x, to_xywh.x, delta);
+                auto interpolated_y = interpolate_length_percentage(calculation_context, from_xywh.x, to_xywh.x, delta);
+                auto interpolated_width = interpolate_length_percentage(calculation_context, from_xywh.width, to_xywh.width, delta);
+                auto interpolated_height = interpolate_length_percentage(calculation_context, from_xywh.height, to_xywh.height, delta);
+                if (!interpolated_x.has_value() || !interpolated_y.has_value() || !interpolated_width.has_value() || !interpolated_height.has_value())
+                    return {};
+                return Xywh { *interpolated_x, *interpolated_y, *interpolated_width, *interpolated_height };
+            },
             [](auto&) -> Optional<BasicShape> {
                 return {};
             });
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.txt
new file mode 100644
index 00000000000..cdd21ccccd1
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.txt
@@ -0,0 +1,366 @@
+Harness status: OK
+
+Found 360 tests
+
+222 Pass
+138 Fail
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.3) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [initial] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (-0.3) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.3) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.5) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (0.6) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1) should be [xywh(10px 10px 100px 100px)]
+Pass	Web Animations: property <clip-path> from [unset] to [xywh(10px 10px 100px 100px)] at (1.5) should be [xywh(10px 10px 100px 100px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [initial]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [initial]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [initial]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (-0.3) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.3) should be [initial]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [initial] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [unset]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [unset]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [unset]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (-0.3) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.3) should be [unset]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.5) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (0.6) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1) should be [rect(10px 100px 100px 10px)]
+Pass	Web Animations: property <clip-path> from [unset] to [rect(10px 100px 100px 10px)] at (1.5) should be [rect(10px 100px 100px 10px)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (-1) should be [xywh(0px 0px 200% 200%)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0) should be [xywh(5px 5px 150% 150%)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.125) should be [xywh(5.63px 5.63px 143.75% 143.75%)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.875) should be [xywh(9.38px 9.38px 106.25% 106.25%)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (1) should be [xywh(10px 10px 100% 100%)]
+Pass	CSS Transitions: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (2) should be [xywh(15px 15px 50% 50%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (-1) should be [xywh(0px 0px 200% 200%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0) should be [xywh(5px 5px 150% 150%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.125) should be [xywh(5.63px 5.63px 143.75% 143.75%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.875) should be [xywh(9.38px 9.38px 106.25% 106.25%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (1) should be [xywh(10px 10px 100% 100%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (2) should be [xywh(15px 15px 50% 50%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (-1) should be [xywh(0px 0px 200% 200%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0) should be [xywh(5px 5px 150% 150%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.125) should be [xywh(5.63px 5.63px 143.75% 143.75%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.875) should be [xywh(9.38px 9.38px 106.25% 106.25%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (1) should be [xywh(10px 10px 100% 100%)]
+Pass	CSS Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (2) should be [xywh(15px 15px 50% 50%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (-1) should be [xywh(0px 0px 200% 200%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0) should be [xywh(5px 5px 150% 150%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.125) should be [xywh(5.63px 5.63px 143.75% 143.75%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (0.875) should be [xywh(9.38px 9.38px 106.25% 106.25%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (1) should be [xywh(10px 10px 100% 100%)]
+Pass	Web Animations: property <clip-path> from [xywh(5px 5px 150% 150%)] to [xywh(10px 10px 100% 100%)] at (2) should be [xywh(15px 15px 50% 50%)]
+Fail	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (-1) should be [rect(-30px 0px 10% -30%)]
+Fail	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0) should be [rect(10px 100px 50% 10%)]
+Fail	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.125) should be [rect(15px 112.5px 55% 15%)]
+Fail	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.875) should be [rect(45px 187.5px 85% 45%)]
+Pass	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (1) should be [rect(50px 200px 90% 50%)]
+Fail	CSS Transitions: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (2) should be [rect(90px 300px 130% 90%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (-1) should be [rect(-30px 0px 10% -30%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0) should be [rect(10px 100px 50% 10%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.125) should be [rect(15px 112.5px 55% 15%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.875) should be [rect(45px 187.5px 85% 45%)]
+Pass	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (1) should be [rect(50px 200px 90% 50%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (2) should be [rect(90px 300px 130% 90%)]
+Fail	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (-1) should be [rect(-30px 0px 10% -30%)]
+Pass	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0) should be [rect(10px 100px 50% 10%)]
+Fail	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.125) should be [rect(15px 112.5px 55% 15%)]
+Fail	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.875) should be [rect(45px 187.5px 85% 45%)]
+Pass	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (1) should be [rect(50px 200px 90% 50%)]
+Fail	CSS Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (2) should be [rect(90px 300px 130% 90%)]
+Fail	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (-1) should be [rect(-30px 0px 10% -30%)]
+Pass	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0) should be [rect(10px 100px 50% 10%)]
+Fail	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.125) should be [rect(15px 112.5px 55% 15%)]
+Fail	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (0.875) should be [rect(45px 187.5px 85% 45%)]
+Pass	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (1) should be [rect(50px 200px 90% 50%)]
+Fail	Web Animations: property <clip-path> from [rect(10px 100px 50% 10%)] to [rect(50px 200px 90% 50%)] at (2) should be [rect(90px 300px 130% 90%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (-1) should be [inset(-80%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0) should be [inset(0%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.125) should be [inset(10%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.875) should be [inset(70%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (1) should be [inset(80%)]
+Fail	CSS Transitions: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (2) should be [inset(160%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (-1) should be [inset(-80%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0) should be [inset(0%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.125) should be [inset(10%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.875) should be [inset(70%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (1) should be [inset(80%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (2) should be [inset(160%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (-1) should be [inset(-80%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0) should be [inset(0%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.125) should be [inset(10%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.875) should be [inset(70%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (1) should be [inset(80%)]
+Fail	CSS Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (2) should be [inset(160%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (-1) should be [inset(-80%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0) should be [inset(0%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.125) should be [inset(10%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (0.875) should be [inset(70%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (1) should be [inset(80%)]
+Fail	Web Animations: property <clip-path> from [rect(auto auto auto auto)] to [rect(80% 20% 20% 80%)] at (2) should be [inset(160%)]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Transitions: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Pass	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Pass	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Pass	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Pass	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	Web Animations: property <clip-path> from neutral to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Transitions: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Pass	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Pass	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Pass	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Pass	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	Web Animations: property <clip-path> from neutral to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Pass	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Pass	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	CSS Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Pass	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (-1) should be [inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)]
+Pass	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.125) should be [inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))]
+Fail	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (0.875) should be [inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))]
+Fail	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (1) should be [inset(50px calc(80% - 70px) calc(0% - 50px) 20%)]
+Fail	Web Animations: property <clip-path> from [inherit] to [xywh(20% 50px 70px 100%)] at (2) should be [inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Transitions: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Pass	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Pass	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	CSS Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Pass	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (-1) should be [inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)]
+Pass	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0) should be [inset(10px calc(0% + 10px) calc(0% + 10px))]
+Pass	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.125) should be [inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))]
+Fail	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (0.875) should be [inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))]
+Fail	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (1) should be [inset(50px calc(100% - 70px) 20% 20%)]
+Fail	Web Animations: property <clip-path> from [inherit] to [rect(50px 70px 80% 20%)] at (2) should be [inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (-1) should be [inset(0% calc(150% - 200px) calc(0% + 200px) -20px round 40px]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0) should be [inset(10% calc(100% - 100px) 50% 0px round 20px)]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.125) should be [inset(11.25% calc(93.75% - 87.5px) calc(56.25% - 25px) 2.5px round 17.5px)]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.875) should be [inset(18.75% calc(56.25% - 12.5px) calc(93.75% - 175px) 17.5px round 2.5px)]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (1) should be [inset(20% 50% calc(100% - 200px) 20px)]
+Fail	CSS Transitions: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (2) should be [inset(30% calc(0% + 100px) calc(150% - 400px) 40px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (-1) should be [inset(0% calc(150% - 200px) calc(0% + 200px) -20px round 40px]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0) should be [inset(10% calc(100% - 100px) 50% 0px round 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.125) should be [inset(11.25% calc(93.75% - 87.5px) calc(56.25% - 25px) 2.5px round 17.5px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.875) should be [inset(18.75% calc(56.25% - 12.5px) calc(93.75% - 175px) 17.5px round 2.5px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (1) should be [inset(20% 50% calc(100% - 200px) 20px)]
+Fail	CSS Transitions with transition: all: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (2) should be [inset(30% calc(0% + 100px) calc(150% - 400px) 40px)]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (-1) should be [inset(0% calc(150% - 200px) calc(0% + 200px) -20px round 40px]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0) should be [inset(10% calc(100% - 100px) 50% 0px round 20px)]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.125) should be [inset(11.25% calc(93.75% - 87.5px) calc(56.25% - 25px) 2.5px round 17.5px)]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.875) should be [inset(18.75% calc(56.25% - 12.5px) calc(93.75% - 175px) 17.5px round 2.5px)]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (1) should be [inset(20% 50% calc(100% - 200px) 20px)]
+Fail	CSS Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (2) should be [inset(30% calc(0% + 100px) calc(150% - 400px) 40px)]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (-1) should be [inset(0% calc(150% - 200px) calc(0% + 200px) -20px round 40px]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0) should be [inset(10% calc(100% - 100px) 50% 0px round 20px)]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.125) should be [inset(11.25% calc(93.75% - 87.5px) calc(56.25% - 25px) 2.5px round 17.5px)]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (0.875) should be [inset(18.75% calc(56.25% - 12.5px) calc(93.75% - 175px) 17.5px round 2.5px)]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (1) should be [inset(20% 50% calc(100% - 200px) 20px)]
+Fail	Web Animations: property <clip-path> from [xywh(0px 10% 100px 40% round 20px)] to [rect(20% 50% 200px 20px)] at (2) should be [inset(30% calc(0% + 100px) calc(150% - 400px) 40px)]
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.html b/Tests/LibWeb/Text/input/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.html
new file mode 100644
index 00000000000..20612d55c3e
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-masking/animations/clip-path-interpolation-xywh-rect.html
@@ -0,0 +1,169 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>clip-path-interpolation for basic-shape-rect, xywh and rect</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#funcdef-basic-shape-xywh">
+<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#funcdef-basic-shape-rect">
+<meta name="assert" content="clip-path supports animation for xywh() and rect()">
+
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../../css/support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  clip-path: inset(10px);
+  padding: 10px;
+}
+
+.target {
+  display: inline-block;
+  width: 100px;
+  height: 100px;
+  background-color: black;
+  clip-path: inset(10px);
+}
+
+.expected {
+  background-color: green;
+}
+</style>
+<body>
+<script>
+test_no_interpolation({
+  property: 'clip-path',
+  from: 'initial',
+  to: 'xywh(10px 10px 100px 100px)',
+});
+
+test_no_interpolation({
+  property: 'clip-path',
+  from: 'unset',
+  to: 'xywh(10px 10px 100px 100px)',
+});
+
+test_no_interpolation({
+  property: 'clip-path',
+  from: 'initial',
+  to: 'rect(10px 100px 100px 10px)',
+});
+
+test_no_interpolation({
+  property: 'clip-path',
+  from: 'unset',
+  to: 'rect(10px 100px 100px 10px)',
+});
+
+// Note: it's fine to use "rect()"/"xywh()" in "expect" because we always
+// convert it into `inset()` when we compare it with the actual animation value.
+test_interpolation({
+  property: 'clip-path',
+  from: 'xywh(5px 5px 150% 150%)',
+  to: 'xywh(10px 10px 100% 100%)'
+}, [
+  {at: -1, expect: 'xywh(0px 0px 200% 200%)'},
+  {at: 0, expect: 'xywh(5px 5px 150% 150%)'},
+  {at: 0.125, expect: 'xywh(5.63px 5.63px 143.75% 143.75%)'},
+  {at: 0.875, expect: 'xywh(9.38px 9.38px 106.25% 106.25%)'},
+  {at: 1, expect: 'xywh(10px 10px 100% 100%)'},
+  {at: 2, expect: 'xywh(15px 15px 50% 50%)'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: 'rect(10px 100px 50% 10%)',
+  to: 'rect(50px 200px 90% 50%)'
+}, [
+  {at: -1, expect: 'rect(-30px 0px 10% -30%)'},
+  {at: 0, expect: 'rect(10px 100px 50% 10%)'},
+  {at: 0.125, expect: 'rect(15px 112.5px 55% 15%)'},
+  {at: 0.875, expect: 'rect(45px 187.5px 85% 45%)'},
+  {at: 1, expect: 'rect(50px 200px 90% 50%)'},
+  {at: 2, expect: 'rect(90px 300px 130% 90%)'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: 'rect(auto auto auto auto)',
+  to: 'rect(80% 20% 20% 80%)'
+}, [
+  {at: -1, expect: 'inset(-80%)'},
+  {at: 0, expect: 'inset(0%)'},
+  {at: 0.125, expect: 'inset(10%)'},
+  {at: 0.875, expect: 'inset(70%)'},
+  {at: 1, expect: 'inset(80%)'},
+  {at: 2, expect: 'inset(160%)'},
+]);
+
+// All <basic-shape-rect>s compute to the equivalent inset() function, so they
+// interpolatable.
+// https://drafts.csswg.org/css-shapes-1/#basic-shape-computed-values
+test_interpolation({
+  property: 'clip-path',
+  from: neutralKeyframe,
+  // inset(50px calc(80% - 70px) calc(0% - 50px) 20%).
+  to: 'xywh(20% 50px 70px 100%)',
+}, [
+  {at: -1, expect: 'inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)'},
+  {at: 0, expect: 'inset(10px calc(0% + 10px) calc(0% + 10px))'},
+  {at: 0.125, expect: 'inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))'},
+  {at: 0.875, expect: 'inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))'},
+  {at: 1, expect: 'inset(50px calc(80% - 70px) calc(0% - 50px) 20%)'},
+  {at: 2, expect: 'inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: neutralKeyframe,
+  // inset(50px calc(100% - 70px) 20% 20%).
+  to: 'rect(50px 70px 80% 20%)',
+}, [
+  {at: -1, expect: 'inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)'},
+  {at: 0, expect: 'inset(10px calc(0% + 10px) calc(0% + 10px))'},
+  {at: 0.125, expect: 'inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))'},
+  {at: 0.875, expect: 'inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))'},
+  {at: 1, expect: 'inset(50px calc(100% - 70px) 20% 20%)'},
+  {at: 2, expect: 'inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: 'inherit',
+  to: 'xywh(20% 50px 70px 100%)',
+}, [
+  {at: -1, expect: 'inset(-30px calc(-80% + 90px) calc(0% + 70px) calc(-20% + 20px)'},
+  {at: 0, expect: 'inset(10px calc(0% + 10px) calc(0% + 10px))'},
+  {at: 0.125, expect: 'inset(15px 10% calc(0% + 2.5px) calc(2.5% + 8.75px))'},
+  {at: 0.875, expect: 'inset(45px calc(70% - 60px) calc(0% - 42.5px) calc(17.5% + 1.25px))'},
+  {at: 1, expect: 'inset(50px calc(80% - 70px) calc(0% - 50px) 20%)'},
+  {at: 2, expect: 'inset(90px calc(160% - 150px) calc(0% - 110px) calc(40% - 10px))'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: 'inherit',
+  to: 'rect(50px 70px 80% 20%)',
+}, [
+  {at: -1, expect: 'inset(-30px calc(-100% + 90px) calc(-20% + 20px) calc(-20% + 20px)'},
+  {at: 0, expect: 'inset(10px calc(0% + 10px) calc(0% + 10px))'},
+  {at: 0.125, expect: 'inset(15px 12.5% calc(2.5% + 8.75px) calc(2.5% + 8.75px))'},
+  {at: 0.875, expect: 'inset(45px calc(87.5% - 60px) calc(17.5% + 1.25px) calc(17.5% + 1.25px))'},
+  {at: 1, expect: 'inset(50px calc(100% - 70px) 20% 20%)'},
+  {at: 2, expect: 'inset(90px calc(200% - 150px) calc(40% - 10px) calc(40% - 10px))'},
+]);
+
+test_interpolation({
+  property: 'clip-path',
+  from: 'xywh(0px 10% 100px 40% round 20px)',
+  to: 'rect(20% 50% 200px 20px)',
+}, [
+  {at: -1, expect: 'inset(0% calc(150% - 200px) calc(0% + 200px) -20px round 40px'},
+  {at: 0, expect: 'inset(10% calc(100% - 100px) 50% 0px round 20px)'},
+  {at: 0.125, expect: 'inset(11.25% calc(93.75% - 87.5px) calc(56.25% - 25px) 2.5px round 17.5px)'},
+  {at: 0.875, expect: 'inset(18.75% calc(56.25% - 12.5px) calc(93.75% - 175px) 17.5px round 2.5px)'},
+  {at: 1, expect: 'inset(20% 50% calc(100% - 200px) 20px)'},
+  {at: 2, expect: 'inset(30% calc(0% + 100px) calc(150% - 400px) 40px)'},
+]);
+
+</script>
+</body>