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chromium/third_party/blink/web_tests/external/wpt/css/css-text/white-space/tab-stop-threshold-005.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: the nearest tab stop is more than 0.5 ch away, white-space:break-spaces</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<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/#tab-size-property">
<link rel="match" href="reference/tab-stop-threshold-001-ref.html">
<meta name="assert" content="A preserved tab pushes to the nearest tap stop as long as we're not closer to it than 0.5ch, under white-space:break-spaces">
<style>
div {
  white-space: break-spaces;
  font-family: monospace;
  tab-size: 8; /* the initial value, but since we're measuring against it, we might as well be sure */
}
span { display: inline-block; }
#s1 { width: 6ch; }
#s2 { width: 7ch; }
#s3 { width: 7.3ch; }
</style>

<p>Test passes if the 4 letters bellow are vertically aligned.
<div><span id=s1></span>&#9;P</div>
<div><span id=s2></span>&#9;A</div>
<div><span id=s3></span>&#9;S</div>
<div>        S</div>