diff --git a/Libraries/LibWeb/CSS/Properties.json b/Libraries/LibWeb/CSS/Properties.json
index a7f5bc49f04..e1b64d73284 100644
--- a/Libraries/LibWeb/CSS/Properties.json
+++ b/Libraries/LibWeb/CSS/Properties.json
@@ -83,6 +83,9 @@
   "-webkit-box-sizing": {
     "legacy-alias-for": "box-sizing"
   },
+  "-webkit-filter": {
+    "legacy-alias-for": "filter"
+  },
   "-webkit-flex": {
     "legacy-alias-for": "flex"
   },
diff --git a/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt b/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
index af1baf2698e..941ff4579a9 100644
--- a/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
+++ b/Tests/LibWeb/Text/expected/css/CSSStyleProperties-all-supported-properties-and-default-values.txt
@@ -84,6 +84,9 @@ All supported properties and their default values exposed from CSSStylePropertie
 'WebkitBoxSizing': 'content-box'
 'webkitBoxSizing': 'content-box'
 '-webkit-box-sizing': 'content-box'
+'WebkitFilter': 'none'
+'webkitFilter': 'none'
+'-webkit-filter': 'none'
 'WebkitFlex': '0 1 auto'
 'webkitFlex': '0 1 auto'
 '-webkit-flex': '0 1 auto'
diff --git a/Tests/LibWeb/Text/expected/wpt-import/compat/css-style-declaration-alias-enumeration.txt b/Tests/LibWeb/Text/expected/wpt-import/compat/css-style-declaration-alias-enumeration.txt
new file mode 100644
index 00000000000..1794ab392ae
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/compat/css-style-declaration-alias-enumeration.txt
@@ -0,0 +1,57 @@
+Harness status: OK
+
+Found 51 tests
+
+40 Pass
+11 Fail
+Pass	webkitAlignContent found on CSSStyleDeclaration
+Pass	webkitAlignItems found on CSSStyleDeclaration
+Pass	webkitAlignSelf found on CSSStyleDeclaration
+Pass	webkitAnimation found on CSSStyleDeclaration
+Pass	webkitAnimationDelay found on CSSStyleDeclaration
+Pass	webkitAnimationDirection found on CSSStyleDeclaration
+Pass	webkitAnimationDuration found on CSSStyleDeclaration
+Pass	webkitAnimationFillMode found on CSSStyleDeclaration
+Pass	webkitAnimationIterationCount found on CSSStyleDeclaration
+Pass	webkitAnimationName found on CSSStyleDeclaration
+Pass	webkitAnimationPlayState found on CSSStyleDeclaration
+Pass	webkitAnimationTimingFunction found on CSSStyleDeclaration
+Fail	webkitBackfaceVisibility found on CSSStyleDeclaration
+Fail	WebKitBackgroundClip found on CSSStyleDeclaration
+Pass	webkitBackgroundOrigin found on CSSStyleDeclaration
+Pass	webkitBackgroundSize found on CSSStyleDeclaration
+Pass	webkitBorderBottomLeftRadius found on CSSStyleDeclaration
+Pass	webkitBorderBottomRightRadius found on CSSStyleDeclaration
+Pass	webkitBorderRadius found on CSSStyleDeclaration
+Pass	webkitBorderTopLeftRadius found on CSSStyleDeclaration
+Pass	webkitBorderTopRightRadius found on CSSStyleDeclaration
+Pass	webkitBoxShadow found on CSSStyleDeclaration
+Pass	webkitBoxSizing found on CSSStyleDeclaration
+Pass	webkitFilter found on CSSStyleDeclaration
+Pass	webkitFlex found on CSSStyleDeclaration
+Pass	webkitFlexBasis found on CSSStyleDeclaration
+Pass	webkitFlexDirection found on CSSStyleDeclaration
+Pass	webkitFlexFlow found on CSSStyleDeclaration
+Pass	webkitFlexGrow found on CSSStyleDeclaration
+Pass	webkitFlexShrink found on CSSStyleDeclaration
+Pass	webkitFlexWrap found on CSSStyleDeclaration
+Pass	webkitJustifyContent found on CSSStyleDeclaration
+Pass	webkitMask found on CSSStyleDeclaration
+Fail	webkitMaskClip found on CSSStyleDeclaration
+Fail	webkitMaskComposite found on CSSStyleDeclaration
+Pass	webkitMaskImage found on CSSStyleDeclaration
+Fail	webkitMaskOrigin found on CSSStyleDeclaration
+Fail	webkitMaskPosition found on CSSStyleDeclaration
+Fail	webkitMaskRepeat found on CSSStyleDeclaration
+Fail	webkitMaskSize found on CSSStyleDeclaration
+Pass	webkitOrder found on CSSStyleDeclaration
+Fail	webkitPerspective found on CSSStyleDeclaration
+Fail	webkitPerspectiveOrigin found on CSSStyleDeclaration
+Pass	webkitTransform found on CSSStyleDeclaration
+Pass	webkitTransformOrigin found on CSSStyleDeclaration
+Fail	webkitTransformStyle found on CSSStyleDeclaration
+Pass	webkitTransition found on CSSStyleDeclaration
+Pass	webkitTransitionDelay found on CSSStyleDeclaration
+Pass	webkitTransitionDuration found on CSSStyleDeclaration
+Pass	webkitTransitionProperty found on CSSStyleDeclaration
+Pass	webkitTransitionTimingFunction found on CSSStyleDeclaration
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/compat/css-style-declaration-alias-enumeration.html b/Tests/LibWeb/Text/input/wpt-import/compat/css-style-declaration-alias-enumeration.html
new file mode 100644
index 00000000000..406b249be52
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/compat/css-style-declaration-alias-enumeration.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<title>Aliases enumerated on CSSStyleDeclaration</title>
+<link rel="help" href="https://compat.spec.whatwg.org/#css-simple-aliases">
+<meta name="assert" content="This test verifies that aliases are enumerated on CSSStyleDeclaration" />
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+<body>
+</body>
+<script>
+const PREFIXED_PROPS = [
+  'webkitAlignContent',
+  'webkitAlignItems',
+  'webkitAlignSelf',
+  'webkitAnimation',
+  'webkitAnimationDelay',
+  'webkitAnimationDirection',
+  'webkitAnimationDuration',
+  'webkitAnimationFillMode',
+  'webkitAnimationIterationCount',
+  'webkitAnimationName',
+  'webkitAnimationPlayState',
+  'webkitAnimationTimingFunction',
+  'webkitBackfaceVisibility',
+  'WebKitBackgroundClip',
+  'webkitBackgroundOrigin',
+  'webkitBackgroundSize',
+  'webkitBorderBottomLeftRadius',
+  'webkitBorderBottomRightRadius',
+  'webkitBorderRadius',
+  'webkitBorderTopLeftRadius',
+  'webkitBorderTopRightRadius',
+  'webkitBoxShadow',
+  'webkitBoxSizing',
+  'webkitFilter',
+  'webkitFlex',
+  'webkitFlexBasis',
+  'webkitFlexDirection',
+  'webkitFlexFlow',
+  'webkitFlexGrow',
+  'webkitFlexShrink',
+  'webkitFlexWrap',
+  'webkitJustifyContent',
+  'webkitMask',
+  'webkitMaskClip',
+  'webkitMaskComposite',
+  'webkitMaskImage',
+  'webkitMaskOrigin',
+  'webkitMaskPosition',
+  'webkitMaskRepeat',
+  'webkitMaskSize',
+  'webkitOrder',
+  'webkitPerspective',
+  'webkitPerspectiveOrigin',
+  'webkitTransform',
+  'webkitTransformOrigin',
+  'webkitTransformStyle',
+  'webkitTransition',
+  'webkitTransitionDelay',
+  'webkitTransitionDuration',
+  'webkitTransitionProperty',
+  'webkitTransitionTimingFunction',
+];
+
+const docBodyStyle = document.body.style;
+for (let prop of PREFIXED_PROPS) {
+  test(() => {
+    assert_true(prop in docBodyStyle);
+  }, `${prop} found on CSSStyleDeclaration`);
+}
+</script>