third_party/blink/web_tests/fast/css-generated-content/quotes-lang-case-insensitive.html - chromium/src - Git at Google

 <!DOCTYPE html>

 <style>
     :lang(CusTom) {
         quotes: "A" "B" "C" "D";
     }
 </style>

 <p>
     You should see the below line printed twice.
 </p>

 ACDB<br>
 <q lang="CUSTOM"><q></q></q>
	<!DOCTYPE html>

	<style>
	:lang(CusTom) {
	quotes: "A" "B" "C" "D";
	}
	</style>

	<p>
	You should see the below line printed twice.
	</p>

	ACDB<br>
	<q lang="CUSTOM"><q></q></q>