diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-001.txt
new file mode 100644
index 00000000000..82548cf33fb
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-001.txt
@@ -0,0 +1,8 @@
+Harness status: OK
+
+Found 2 tests
+
+1 Pass
+1 Fail
+Pass	row visibility:collapse doesn't change table width, unlike display:none
+Fail	row visibility:collapse changes table height, unlike visibility:hidden
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.txt
new file mode 100644
index 00000000000..82548cf33fb
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.txt
@@ -0,0 +1,8 @@
+Harness status: OK
+
+Found 2 tests
+
+1 Pass
+1 Fail
+Pass	row visibility:collapse doesn't change table width, unlike display:none
+Fail	row visibility:collapse changes table height, unlike visibility:hidden
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.txt
new file mode 100644
index 00000000000..82548cf33fb
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.txt
@@ -0,0 +1,8 @@
+Harness status: OK
+
+Found 2 tests
+
+1 Pass
+1 Fail
+Pass	row visibility:collapse doesn't change table width, unlike display:none
+Fail	row visibility:collapse changes table height, unlike visibility:hidden
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-004.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-004.txt
new file mode 100644
index 00000000000..d9631d6112e
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-004.txt
@@ -0,0 +1,6 @@
+Harness status: OK
+
+Found 1 tests
+
+1 Fail
+Fail	collapsed row shrinks table height
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-005.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-005.txt
new file mode 100644
index 00000000000..f50a1c5abfe
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-005.txt
@@ -0,0 +1,7 @@
+Harness status: OK
+
+Found 2 tests
+
+2 Fail
+Fail	collapsed row should not contribute to overflow
+Fail	collapsed section should not contribute to overflow
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-001.txt
new file mode 100644
index 00000000000..fd9b968a1f6
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-001.txt
@@ -0,0 +1,11 @@
+Harness status: OK
+
+Found 5 tests
+
+2 Pass
+3 Fail
+Pass	row group visibility:collapse doesn't change table width
+Fail	row group visibility:collapse changes table height
+Fail	the first row should be collapsed
+Fail	the second row should be collapsed
+Pass	the third row stays the same
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-002.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-002.txt
new file mode 100644
index 00000000000..b648541c071
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-tables/visibility-collapse-row-group-002.txt
@@ -0,0 +1,8 @@
+Harness status: OK
+
+Found 2 tests
+
+1 Pass
+1 Fail
+Pass	row group visibility:collapse doesn't change table width
+Fail	row group visibility:collapse changes table height
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-001.html
new file mode 100644
index 00000000000..7796e5b5622
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-001.html
@@ -0,0 +1,80 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='support/base.css' />
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<style>
+    x-table {
+      border: 5px solid black;
+    }
+    x-table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">Spec</a>
+    <p>
+    Setting a row to visibility:collapse changes table height but not width.
+    </p>
+    <x-table id="one">
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+    Bottom table is identical to top except row 1 has been collapsed.
+    <x-table id="two">
+        <x-tr style="visibility:collapse">
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+</main>
+
+<script>
+    generate_tests(assert_equals, [
+        [
+            "row visibility:collapse doesn't change table width, unlike display:none",
+            document.getElementById('two').offsetWidth,
+            document.getElementById('one').offsetWidth
+        ],
+        [
+            "row visibility:collapse changes table height, unlike visibility:hidden",
+            document.getElementById('two').offsetHeight,
+            116
+        ]
+    ]);
+</script>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.html
new file mode 100644
index 00000000000..756ce1421f7
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-002-dynamic.html
@@ -0,0 +1,89 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='support/base.css' />
+<link rel="author" title="Joy Yu" href="mailto:joysyu@mit.edu">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<style>
+    x-table {
+      border: 5px solid black;
+    }
+    x-table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">Spec</a>
+    <p>
+    Setting a row to visibility:collapse changes table height but not width.
+    </p>
+    <x-table id="one">
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+    Bottom table is identical to top except row 2 has been collapsed.
+    <x-table id="two">
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr id="collapse">
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+</main>
+
+<script>
+    row = document.getElementById("collapse");
+    row.style.visibility = "collapse";
+
+    tests = [
+        [
+            document.getElementById('two').offsetWidth,
+            document.getElementById('one').offsetWidth,
+            "row visibility:collapse doesn't change table width, unlike display:none"
+        ],
+        [
+            document.getElementById('two').offsetHeight,
+            116,
+            "row visibility:collapse changes table height, unlike visibility:hidden"
+        ]];
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.html
new file mode 100644
index 00000000000..72a51a318b4
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-003-dynamic.html
@@ -0,0 +1,89 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='support/base.css' />
+<link rel="author" title="Joy Yu" href="mailto:joysyu@mit.edu">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<style>
+    x-table {
+      border: 5px solid black;
+    }
+    x-table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">Spec</a>
+    <p>
+    Setting a row to visibility:collapse changes table height but not width.
+    </p>
+    <x-table id="one">
+        <x-tr>
+            <x-td>
+                <img src="../support/cat.png">
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+    Bottom table is identical to top except row 1 has been collapsed.
+    <x-table id="two">
+        <x-tr id="collapse">
+            <x-td>
+                <img src="../support/cat.png">
+            </x-td>
+            <x-td>
+                <span></span><span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+</main>
+
+<script>
+    row = document.getElementById("collapse");
+    row.style.visibility = "collapse";
+
+    tests = [
+        [
+            document.getElementById('two').offsetWidth,
+            document.getElementById('one').offsetWidth,
+            "row visibility:collapse doesn't change table width, unlike display:none"
+        ],
+        [
+            document.getElementById('two').offsetHeight,
+            116,
+            "row visibility:collapse changes table height, unlike visibility:hidden"
+        ]];
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-004.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-004.html
new file mode 100644
index 00000000000..6e0d8cc30c6
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-004.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel="author" title="Aleks Totic" href="mailto:atotic@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS2/tables.html#dynamic-effects">
+<style>
+  table { background: red;}
+  td { background:green; padding: 0;}
+</style>
+<main>
+  <h1>Visibility collapse changes table height even when its height is fixed</h1>
+
+  <table style="height:150px;border-spacing: 0">
+    <tr>
+      <td style="width:50px">a</td>
+    </tr>
+    <tr style="visibility:collapse">
+      <td style="width:100px">hello</td>
+    </tr>
+    <tr>
+      <td>b</td>
+    </tr>
+  </table>
+</main>
+<script>
+  test(function() {
+    let t = document.querySelector("table");
+    assert_equals(t.offsetWidth, 100);
+    assert_equals(t.offsetHeight, 100);
+  }, "collapsed row shrinks table height");
+</script>
+
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-005.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-005.html
new file mode 100644
index 00000000000..d2f91f68f29
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-005.html
@@ -0,0 +1,69 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel="author" title="Aleks Totic" href="mailto:atotic@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<style>
+  main table {
+    border-spacing: 0;
+  }
+  main td {
+    width: 50px;
+    height: 50px;
+    background: gray;
+    padding: 0;
+  }
+</style>
+<main>
+  <h1>Visibility collapse and overflow</h1>
+  <p>Collapsed row should not contribute to overflow</p>
+  <div id="row" style="overflow-y: auto;  width: 200px; height: 100px;border:1px solid black;">
+    <table>
+      <tbody>
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+        <tr style="visibility: collapse">
+          <td></td>
+          <td></td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+  <p>Collapsed section should not contribute to overflow</p>
+  <div id="section" style="overflow-y: auto;  width: 200px; height: 50px;border:1px solid black;">
+    <table>
+      <thead>
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+      </thead>
+      <tbody style="visibility:collapse">
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+</main>
+<script>
+  test( _ => {
+    assert_equals(document.querySelector("#row").scrollHeight, 100);
+  }, "collapsed row should not contribute to overflow");
+  test( _ => {
+    assert_equals(document.querySelector("#section").scrollHeight, 50);
+  }, "collapsed section should not contribute to overflow");
+</script>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-001.html
new file mode 100644
index 00000000000..f81296b3a0d
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-001.html
@@ -0,0 +1,124 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='support/base.css' />
+<link rel="author" title="Joy Yu" href="mailto:joysyu@mit.edu">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<link rel="help" href="https://www.w3.org/TR/2017/WD-css-tables-3-20170307/#visible-track">
+<style>
+    x-table {
+      border: 5px solid black;
+    }
+    x-table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">Spec</a>
+    <p>
+    Collapsing a row group but making its rows visible should still result in a
+    collapsed row group.
+    </p>
+    <x-table id="one">
+      <x-tbody>
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+      </x-tbody>
+        <x-tr id="thirdRowRef">
+            <x-td>
+                <span>row 3</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+    When row group is collapsed, visible rows within the row group are still collapsed and therefore invisible.
+    <x-table id="two">
+      <x-tbody style="visibility:collapse;">
+        <x-tr style="visibility:visible;" id="firstRow">
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+        <x-tr style="visibility:visible;" id="secondRow">
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-tbody>
+        <x-tr id="thirdRow">
+            <x-td>
+                <span>row 3</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+</main>
+
+<script>
+    tests = [
+    [
+        document.getElementById('two').offsetWidth,
+        document.getElementById('one').offsetWidth,
+        "row group visibility:collapse doesn't change table width"
+    ],
+    [
+        document.getElementById('two').offsetHeight,
+        116,
+        "row group visibility:collapse changes table height"
+    ],
+    [
+        document.getElementById('firstRow').offsetHeight,
+        0,
+        "the first row should be collapsed"
+    ],
+    [
+        document.getElementById('secondRow').offsetHeight,
+        0,
+        "the second row should be collapsed"
+    ],
+    [
+        document.getElementById('thirdRow').offsetHeight,
+        document.getElementById('thirdRowRef').offsetHeight,
+        "the third row stays the same"
+    ]];
+
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-002.html b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-002.html
new file mode 100644
index 00000000000..443472e759a
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-tables/visibility-collapse-row-group-002.html
@@ -0,0 +1,107 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
+<link rel='stylesheet' href='support/base.css' />
+<link rel="author" title="Joy Yu" href="mailto:joysyu@mit.edu">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">
+<style>
+    x-table {
+      border: 5px solid black;
+    }
+    x-table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-height">Spec</a>
+    <p>
+    Setting row group to visibility:collapse changes table height but not width.
+    </p>
+    <x-table id="one">
+      <x-tbody>
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-tbody>
+        <x-tr>
+            <x-td>
+                <span>row 3</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+    Bottom table is identical to top except row group of first two rows has been collapsed.
+    <x-table id="two">
+      <x-tbody style="visibility:collapse;">
+        <x-tr>
+            <x-td>
+                <span>row 1</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+        <x-tr>
+            <x-td>
+                <span>row 2</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-tbody>
+        <x-tr>
+            <x-td>
+                <span>row 3</span>
+            </x-td>
+            <x-td>
+                <span></span>
+            </x-td>
+        </x-tr>
+    </x-table>
+</main>
+
+<script>
+    tests = [
+    [
+        document.getElementById('two').offsetWidth,
+        document.getElementById('one').offsetWidth,
+        "row group visibility:collapse doesn't change table width"
+    ],
+    [
+        document.getElementById('two').offsetHeight,
+        116,
+        "row group visibility:collapse changes table height"
+    ]];
+
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>
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