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+<!doctype html>
+<meta charset="utf-8">
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+<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-width">
+<style>
+    table {
+      border: 5px solid black;
+    }
+    table span {
+        display: inline-block;
+        vertical-align: top;
+        background: lime;
+        margin: 3px;
+        height: 100px;
+        width: 100px;
+    }
+</style>
+<main>
+    <h1>Dynamic Visibility collapse</h1>
+    <a href="https://drafts.csswg.org/css-tables-3/#computing-the-table-width">Spec</a>
+    <p>
+    Setting a column to visibility:collapse changes table width but not height.
+    Bottom table is identical to top except left column has been collapsed.
+    </p>
+    <table id="test">
+      <colgroup id="collapse"></colgroup>
+      <tbody>
+        <tr>
+            <td>
+                <span>row 1</span>
+            </td>
+            <td>
+                <span></span>
+            </td>
+        </tr>
+        <tr>
+            <td>
+                <span>row 2</span>
+            </td>
+            <td>
+                <span></span>
+            </td>
+        </tr>
+        <tr>
+            <td>
+                <span>row 3</span>
+            </td>
+            <td>
+                <span style="height:50px"></span>
+            </td>
+        </tr>
+      </tbody>
+    </table>
+</main>
+
+<script>
+    colgroup = document.getElementById("collapse");
+    colgroup.style.visibility = "collapse";
+
+    tests = [
+        [
+            document.getElementById('test').offsetHeight,
+            342,
+            "col visibility:collapse doesn't change table height",
+        ],
+        [
+            document.getElementById('test').offsetWidth,
+            122,
+            "col visibility:collapse changes table width"
+        ]];
+    for (i = 0; i< tests.length; i++) {
+        test(function()
+            {
+                assert_equals.apply(this, tests[i]);
+            },
+            tests[i][2]);
+    };
+</script>
+</html>