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<!DOCTYPE html>
<style>
div { color: red; }
div::first-line { color: green }
#y { display: inline-block; }
</style>
<div id="x"><span id="y">This should be </span></div>
<script>
x.offsetWidth;
var span = document.createElement('span');
span.textContent = 'green';
y.appendChild(span);
</script>
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