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<!DOCTYPE html>
<html class="reftest-wait">
<title>Test that opacity changes on layers make the Compositor repaint the right area</title>
<style>
#box {
width: 100px;
height: 100px;
border: 10px solid black;
opacity: 1;
will-change: opacity;
}
#box.halfTransparent {
opacity: 0.5;
}
</style>
<div id="box"></div>
<script>
window.addEventListener("MozReftestInvalidate", function (e) {
document.getElementById("box").className = "halfTransparent";
document.documentElement.removeAttribute("class");
});
</script>
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