servo/tests/wpt/web-platform-tests/css/css-contain/contain-layout-004.html

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HTML

<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: layout containment on ruby-text-container</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<meta name=flags content="ahem">
<meta name=assert content="layout containment does not apply to ruby-text-container">
<link rel="match" href="reference/contain-layout-004-ref.html">
<link rel=help href="https://drafts.csswg.org/css-contain-1/#containment-layout">
<style>
rtc {
contain: layout;
display: ruby-text-container;
font-family: ahem;
font-size: 20px;
line-height: 1;
}
rtc::before {
content: "X";
color: green;
}
rtc::after {
content: "X";
color: white;
position: absolute;
top:0; left: 0;
}
</style>
<p>This test passes if you can see a green box below.
<div><ruby><rtc></rtc></ruby></div>