mozilla-central/testing/web-platform/tests/css/css-text/line-breaking/line-breaking-013.html

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<!doctype html>
<html>
<meta charset="utf-8">
<title>CSS Text — line breaking of emoji sequences that should form single clusters</title>
<meta name=assert content="A UA must use the extended grapheme cluster (not legacy grapheme cluster), as defined in [UAX29], as the basis for its typographic character unit.">
<link rel=match href="reference/line-breaking-013-ref.html">
<link rel=author title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<style>
div {
line-height: 1em;
font-size: 30px;
}
.container {
position: relative;
margin: .5em;
}
.ref {
background-color: white;
padding: .25em;
}
.test {
color: transparent;
background-color: red;
position: absolute;
width: .5em;
left: 0;
top: 0;
padding: .25em;
z-index: -1;
}
</style>
<body>
<p>Each emoji should appear on a single line with no red background.</p>
<div class=container>
<div class=ref>&#x1F468;&#x200D;&#x1F4BB;</div><!-- man technologist -->
<div class=test>&#x1F468;&#x200D;&#x1F4BB;</div>
</div>
<div class=container>
<div class=ref>&#x1F469;&#x200D;&#x1F467;&#x200D;&#x1F466;</div><!-- family with mother, son and daughter -->
<div class=test>&#x1F469;&#x200D;&#x1F467;&#x200D;&#x1F466;</div>
</div>
<div class=container>
<div class=ref>&#x1F939;&#x200D;&#x2640;&#xFE0F;</div><!-- woman juggling -->
<div class=test>&#x1F939;&#x200D;&#x2640;&#xFE0F;</div>
</div>
<div class=container>
<div class=ref>&#x26F9;&#x1F3FF;&#x200D;&#x2640;&#xFE0F;</div><!-- woman basketball player (fitzpatrick type 6) -->
<div class=test>&#x26F9;&#x1F3FF;&#x200D;&#x2640;&#xFE0F;</div>
</div>
<div class=container>
<div class=ref>&#x1F3F3;&#xFE0F;&#x200D;&#x1F308;</div><!-- rainbow flag -->
<div class=test>&#x1F3F3;&#xFE0F;&#x200D;&#x1F308;</div>
</div>
<div class=container>
<div class=ref>&#x1F3F4;&#xE0067;&#xE0062;&#xE0077;&#xE006C;&#xE0073;&#xE007F;</div><!-- flag of Wales -->
<div class=test>&#x1F3F4;&#xE0067;&#xE0062;&#xE0077;&#xE006C;&#xE0073;&#xE007F;</div>
</div>
</body>
</html>