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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
#id160::first-letter{
color:blue;
}
</style>
<div style="columns:10;">
<div style="display:flex;"></div>
<div style="display:grid;"></div>
<div style="display:table;"></div>
<math id="id160" style="display:list-item;">
<form>
f
</form>
</math>
</div>
<script>
document.execCommand("SelectAll");
</script>