<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>CSS Writing Modes Test: 'vertical-rl' and margin collapsing - right margin of a block collapses with right margin of its first child</title> <link rel="author" title="GĂ©rard 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.xht" /> <!-- Test adapted from http://test.csswg.org/suites/css2.1/nightly-unstable/html4/margin-collapse-017.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, in a vertical-rl context, the right margin an in-flow block box collapses with its first in-flow block-level child's right margin if the element has no top border, no top padding, and the child has no clearance." /> <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> <style type="text/css"><![CDATA[ div { font: 25px/1em Ahem; height: 4em; } div#wrapper { background: red url("support/margin-collapse-2em-space-wm-vert.png"); border-right: green solid 1em; width: 3em; writing-mode: vertical-rl; } div#parent { margin-right: 2em; /* block-start margin */ } div#first-child { background-color: green; margin-right: 2em; /* block-start margin of child */ width: 1em; } ]]></style> </head> <body> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div id="wrapper"> <div id="parent"> <div id="first-child"></div> </div> </div> </body> </html>