layout/reftests/first-letter/dynamic-5.html


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<!DOCTYPE html>
<style>
fieldset::first-letter {
  color: red;
}
fieldset.f::first-letter {
  color: green;
}
</style>
<fieldset>Text</fieldset>
<script>
window.onload = function() {
  document.querySelector('fieldset').classList.add('f');
}
</script>