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<!DOCTYPE html>
<html>
<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" class="halfTransparent"></div>