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chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-transform/text-transform-upperlower-106.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text Test: text-transform uppercase Greek acute diaeresis iota and selection</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-text/#propdef-text-transform">
<link rel="match" href="reference/text-transform-upperlower-106-ref.html">
<meta name="assert" content="text-transform: uppercase will uppercase the Greek acute diaeresis iota by removing acute, and the rendered character is selectable.">
<style>
#target {
  text-transform: uppercase;
  color: white;
  background: red;
}
#target::selection {
  background: green;
}
</style>

<p>The test passes if you see red below (by selecting the first letter only).</p>

<span id="target" lang="el">&#x0399;&#x0308;&#x0301;&#x03A1;</span>

<script>
  window.getSelection().setBaseAndExtent(target.firstChild, 0, target.firstChild, 3);
</script>