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<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<style>
#target {
top: 40px;
width: 150px;
height: 75px;
background-color: yellow;
transform: translateZ(0);
opacity: 0;
}
</style>
<div id="target"></div>
<script>
description("Test that opacity changes from less than 1 to 1 don't cause layout if the layer remains a stacking context");
var div = document.getElementById('target');
div.offsetTop;
div.style.opacity = 1;
shouldBe("internals.updateStyleAndReturnAffectedElementCount()", "1");
shouldBe("internals.needsLayoutCount()", "0");
</script>
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