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Test Info:
<!DOCTYPE HTML>
<html class="reftest-wait">
<style>
p:not(.state-one) > span {
text-decoration: underline;
}
p > span > span {
vertical-align: -2em;
}
p:not(.state-three) > span > span {
visibility: hidden;
}
</style>
<p class="state-one"><span>This text<br>
has <span>an underline</span>.</span></p>
<script>
var p = document.getElementsByTagName("p")[0];
p.offsetLeft; // flush layout
document.getElementsByTagName('p')[0].className = 'state-two';
document.addEventListener("MozReftestInvalidate", step_three);
function step_three(event) {
document.getElementsByTagName('p')[0].className = 'state-three';
document.documentElement.classList.remove("reftest-wait");
}
</script>