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Test Info:
<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for logical margins on h[123] elements in the UA style sheet</title>
<style>
.v-rl { writing-mode: vertical-rl; }
.ltr, .rtl, .v-rl { border: 1px solid blue; }
h1, h2, h3 { font-size: 16px; border: 1px solid purple; }
</style>
<div class=ltr>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
</div>
<div class=rtl dir=rtl>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
</div>
<div class=v-rl>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
</div>