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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://drafts.csswg.org/css-box-3/#visibility-prop">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#visibility-collapse-cell-rendering">
+<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>
+ When setting any element that is not a row, col, row group, or col group,
+ visibility:collapse is equivalent to visibility:hidden.
+ </p>
+ <x-table id="one">
+ <x-tr>
+ <x-td id="visibleCell">
+ <span>row 1</span>
+ </x-td>
+ <x-td>
+ <span id="visibleSpan"></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 top cells have been collapsed.
+ <x-table id="two">
+ <x-tr>
+ <x-td id="hiddenCell" style="visibility:collapse">
+ <span>row 1</span>
+ </x-td>
+ <x-td>
+ <span id="hiddenSpan" style="visibility:collapse"></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>
+ tests = [
+ [
+ document.getElementById('two').offsetWidth,
+ document.getElementById('one').offsetWidth,
+ "table width is unchanged"
+ ],
+ [
+ document.getElementById('two').offsetHeight,
+ document.getElementById('one').offsetHeight,
+ "table height is unchanged"
+ ],
+ [
+ document.getElementById('hiddenCell').offsetWidth,
+ document.getElementById('visibleCell').offsetWidth,
+ "td visibility:collapse has no effect on td width"
+ ],
+ [
+ document.getElementById('hiddenCell').offsetHeight,
+ document.getElementById('visibleCell').offsetHeight,
+ "td visibility:collapse has no effect on td height"
+ ],
+ [
+ document.getElementById('hiddenSpan').offsetWidth,
+ document.getElementById('visibleSpan').offsetWidth,
+ "span visibility:collapse has no effect on span width"
+ ],
+ [
+ document.getElementById('hiddenSpan').offsetHeight,
+ document.getElementById('visibleSpan').offsetHeight,
+ "span visibility:collapse has no effect on span height"
+ ]];
+
+ for (i = 0; i< tests.length; i++) {
+ test(function()
+ {
+ assert_equals.apply(this, tests[i]);
+ },
+ tests[i][2]);
+ };
+</script>
+</html>