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Test Info:

<!doctype HTML>
<link rel=author href="mailto:vmpstr@chromium.org">
<link rel=help href="https://crbug.com/1276488">
<style>
.first + .second {}
</style>
<script>
const details = document.createElement('details');
const ol = document.createElement('ol');
const text = document.createTextNode('abcdefghijklmnopqrstuvxyz');
function step3() {
ol.setAttribute('class', 'first');
}
function step2() {
details.appendChild(text);
requestAnimationFrame(step3);
}
function runTest() {
document.documentElement.appendChild(details);
details.appendChild(ol);
requestAnimationFrame(step2);
}
onload = runTest;
</script>