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chromium/third_party/blink/web_tests/external/wpt/css/css-text/line-breaking/line-breaking-013.html 

<!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=help href="https://www.w3.org/TR/css-text-3/#characters">
<link rel=match href="reference/line-breaking-013-ref.html">
<link rel=author title="Jonathan Kew" href="mailto:[email protected]">
<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>