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chromium/third_party/blink/web_tests/fast/css-generated-content/nested-quote-more-than-pairs.html 

<!DOCTYPE html>

<style>
    q { quotes: "A" "B" "C" "D"; }
</style>

<p>
    The last pair should be repeated when nested beyond the number of pairs. 
    You should see the below line printed twice.
</p>

ACCCDDDB<br>
<q><q><q><q></q></q></q></q>