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chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-transform/reference/text-transform-uppercase-dynamic-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.test { text-transform: uppercase; }
</style>
<div class="test" lang="my">
  <span id="sp">i̇̃ Ĩ</span>
</div>