root-background-fixed-attachment-positioning-expected.html

<!DOCTYPE html>
<style>
html {
    background: url('../../paint/invalidation/resources/grid.png');
}
span {
    position: relative;
    left: 12px;
    top: 34px;
}
</style>
<span>Root background with fixed attachment shouldn't be affected by layout of the root box.</span>

chromium/third_party/blink/web_tests/fast/backgrounds/root-background-fixed-attachment-positioning-expected.html