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chromium/third_party/blink/web_tests/fast/css/first-letter-invalid-property-crash.html 

<!DOCTYPE html>
<style>
div::first-letter {
      position: inherit;
}
div:after {
      quotes: "a" "b";
            content: open-quote
}
</style>

PASS if the test does not CRASH.

<div></div>
<div></div>