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chromium/third_party/blink/web_tests/external/wpt/css/css-text/white-space/trailing-ideographic-space-break-spaces-008.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: Breaking sequences of trailing ideograohic spaces </title>
<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:[email protected]"/>
<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-break-spaces">
<link rel="match" href="reference/white-space-break-spaces-005-ref.html">
<meta name="assert" content="Setting white-space to 'break-spaces' doesn't prevent overflow if the first ideographic space of the sequence doesn't fit, which must hang.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
div {
    font: 25px/1 Ahem;
    color: transparent;
    height: 100px;
}
.test {
    width: 3ch;
    white-space: break-spaces;
}
.test > span { background: green; }
.ref {
    width: 100px;
    background: green;
    position: absolute;
    z-index: -1;
}
.ref > span { color: red; }
</style>

<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
<div class="ref">XXX<span>X</span></div>
<div class="test">XXX<span>&#x3000;</span>X</div>