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+<!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>
+table {
+    border-spacing: 0;
+    border-collapse: collapse;
+}
+table td {
+    border: 1px solid blue;
+    padding: 5px;
+}
+</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.
+    Here the spanning cell and another cell are in the same row.
+    </p>
+    <table id="one">
+        <tr id="firstRowRef">
+            <td>aaaa</td>
+        </tr>
+        <tr id="secondRowRef">
+            <td>bbbb</td>
+        </tr>
+        <tr id="collapsedRowRef">
+            <td rowspan="2">spanning</td>
+            <td>cccc</td>
+        </tr>
+        <tr id="fourthRowRef">
+            <td>dddd</td>
+        </tr>
+        <tr id="fifthRowRef">
+            <td>eeee</td>
+        </tr>
+    </table>
+    Bottom table is identical to top except third row has been collapsed.
+    <table id="two">
+        <tr id="firstRow">
+            <td>aaaa</td>
+        </tr>
+        <tr id="secondRow">
+            <td>bbbb</td>
+        </tr>
+        <tr style="visibility:collapse;" id="collapsedRow">
+            <td rowspan="2">spanning</td>
+            <td>cccc</td>
+        </tr>
+        <tr id="fourthRow">
+            <td>dddd</td>
+        </tr>
+        <tr id="fifthRow">
+            <td>eeee</td>
+        </tr>
+    </table>
+</main>
+
+<script>
+    tests = [
+        [
+            document.getElementById('two').offsetWidth,
+            document.getElementById('one').offsetWidth,
+            "spanning row visibility:collapse doesn't change table width"
+        ],
+        [
+            document.getElementById('collapsedRow').offsetHeight,
+            0,
+            "collapsed row has zero height"
+        ],
+        [
+            document.getElementById('firstRow').offsetHeight,
+            document.getElementById('firstRowRef').offsetHeight,
+            "first row height doesn't change"
+        ],
+        [
+            document.getElementById('secondRow').offsetHeight,
+            document.getElementById('secondRowRef').offsetHeight,
+            "second row height doesn't change"
+        ],
+        [
+            document.getElementById('fourthRow').offsetHeight,
+            document.getElementById('fourthRowRef').offsetHeight,
+            "fourth row height doesn't change"
+        ],
+        [
+            document.getElementById('fifthRow').offsetHeight,
+            document.getElementById('fifthRowRef').offsetHeight,
+            "fifth row height doesn't change"
+        ]];
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>