css/css-text/writing-system/writing-system-text-transform-001.html

<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS test: text-transform and writing systems</title>
<link rel=author title="Florian Rivoal" href="https://florian.rivoal.net">
<link rel=help href="https://drafts.csswg.org/css-text-3/#languages">
<link rel=help href="https://drafts.csswg.org/css-text-3/#script-tagging">
<link rel=help href="https://drafts.csswg.org/css-text-3/#propdef-text-transform">
<link rel=match href="reference/writing-system-text-transform-001-ref.html">
<meta name=assert content="text transform rules that depend on the language are overriden by a contradicting explicit script tag.">
<style>
div {
  text-transform: lowercase;
  font-size: 3em;
}
</style>
<p>Test passes if the two words below are identical: there must be a dot on the “i” letter at the beginning of the word.
<div lang=tr-Cyrl>IСТАНБУЛ</div>
<div lang=tr-Cyrl>iстанбул</div>