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Test Info:
<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Changes to background-position should not cause things to repaint that don't intersect the background image.</title>
<style>
body {
margin: 0;
}
#background {
height: 512px;
background-image: url(image_rgrg-256x256.png);
background-repeat: no-repeat;
background-position: 300px 50px;
}
#not-intersecting-background {
box-sizing: border-box;
width: 200px;
height: 200px;
margin: 50px;
border: 1px solid lime;
}
</style>
<div id="background">
<div id="not-intersecting-background" class="reftest-no-paint"></div>
</div>
<script>
function doTest() {
document.querySelector("#background").style.backgroundPosition = "300px 100px";
document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>