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Test Info:

<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: layout containment on ruby-text</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">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
div {
position: relative;
background: red;
width: 100px;
height: 100px;
padding: 25px;
box-sizing: border-box;
}
rt {
contain: layout;
display: ruby-text;
font-family: Ahem;
font-size: 100px;
line-height: 1;
}
rt::after {
content: "X";
color: green;
position: absolute;
top:0; left: 0;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div><ruby><rt></rt></ruby></div>