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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">
+<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>