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<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: paint containment on ruby-text</title>
<style>
rt {
display: ruby-text;
font-size: 1rem;
font-family: monospace;
}
</style>
<p>This test passes if you can see the word PASS below.
<div><ruby><rt><span style="margin-left: 4ch;"></span>PASS</rt></ruby></div>