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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<style>
div {
width: 500px;
height: 500px;
opacity: 0.5;
background-color: lime;
}
</style>
<div id="d"></div>
<script>
function doTest() {
document.getElementById("d").style.opacity = 1;
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>