chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-transform/text-transform-fullwidth-008.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: text-transform:fullwidth and trailing spaces</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<link rel="help" href="https://www.w3.org/TR/css-text-3/#text-transform-property">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
<link rel="match" href="reference/text-transform-fullwidth-008-ref.html">
<meta name="assert" content="full-width does transforms U+0020 spaces to U+3000 after phase 1, but before phase 2, so that end-of-line transformed spaces get the same treatment as natural ones: hang when white-space is normal.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
div {
  font: 20px/1 Ahem;
  margin: 1em 0;
}
.pre {
  white-space: pre;
}
#test, #ref {
  width: 2em;
  text-align: right;
}
span {
  text-transform: full-width;
}
#test2, #ref2 {
  width: min-content;
  margin-left: 1em;
  background: black;
}
</style>

<p>Test passes if all black boxes below have the same width and height and are aligned vertically.
<div class=pre> x<br> x</div>
<div id=ref>x&#x3000;x</div>
<div id=test>x<span> </span>x</div>
<div id=ref2>x&#x3000;x</div>
<div id=test2>x<span> </span>x</div>