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chromium/third_party/blink/web_tests/fast/backgrounds/root-background-with-page-scaled-out-expected.html 

<!DOCTYPE html>
<html style="background:green;">
<head>
<script>
if (window.internals) {
    internals.setPageScaleFactorLimits(0.5, 4);
    internals.setPageScaleFactor(0.5);
}
</script>
</head>
<body>
</body>