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+<!doctype html>
+<meta charset=utf-8>
+<title>CSS-content test: first letter with quotes interaction dynamic style change</title>
+<link rel="author" title="Daniil Sakhapov" href="sakhapov@google.com">
+<link rel="match" href="reference/quotes-first-letter-001-ref.html">
+<link rel=help href="https://drafts.csswg.org/css-content/#quotes">
+
+<style>
+  #outer { quotes: "'X" "'Y"; }
+  #outer::first-letter { color: red; }
+  #outer.green::first-letter { color: green; }
+</style>
+
+<div id="outer"><div id="inner"><q>First letter</q></div></div>
+
+<script>
+  document.body.offsetTop;
+  outer.className = "green";
+</script>