gecko-dev/layout/reftests/layers/opacity-blending-ref.html

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HTML

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Compositor opacity blending should work correctly (and the same as canvas)</title>
<html class="reftest-wait">
<head>
<script>
function load() {
var one = document.getElementById("one").getContext("2d");
one.fillStyle = "rgba(255,0,0,0.5)";
one.fillRect(0, 0, 200, 200);
one.fillStyle = "rgba(0,255,0,0.5)";
one.fillRect(0, 0, 200, 200);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="load()">
<div style="opacity:0.8">
<canvas id="one" style="position:absolute; left:0px;"></canvas>
</div>
</body>
</html>