servo/tests/wpt/css-tests/css-writing-modes-3_dev/html/margin-collapse-vlr-025.htm

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>CSS Writing Modes Test: 'vertical-lr' and margin collapsing - collapse through empty siblings</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<link rel="help" href="http://www.w3.org/TR/css-writing-modes-3/#logical-direction-layout" title="7.4 Flow-Relative Mappings">
<link rel="match" href="reference/ref-filled-green-100px-square.htm">
<!--
Test adapted from
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/margin-collapse-016.htm
"
The margin collapsing rules apply exactly with the block-start margin substituted for the top margin and the block-end margin substituted for the bottom margin.
"
-->
<meta content="ahem image" name="flags">
<meta name="assert" content="This test checks that margins can collapse through empty elements in 'vertical-lr' writing-mode.">
<style type="text/css">
div
{
font: 25px/1em Ahem;
height: 4em;
}
div#wrapper
{
background-image: url("support/margin-collapse-2em-space-wm-vert.png");
background-position: -1em top;
border-left: green solid 1em;
border-right: green solid 1em;
writing-mode: vertical-lr;
}
div.widthless
{
margin-right: 2em;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="wrapper">
<div class="widthless"></div>
<div class="widthless"></div>
</div>
</body>
</html>