paint-containment-with-fixed-position-scrolled.html

<!DOCTYPE html>
<style>
div {
    width: 100px;
    height: 50px;
}
.container {
    contain: paint;
    background-color: red;
}
.fixed {
    position: fixed;
    top: 0px;
    left: 0px;
    background-color: green;
}
.inline {
    display: inline-block;
}
.spacer {
    position:absolute;
    height: 2000px;
}
</style>
<script>
onload = function() {
    window.scrollTo(0, 25);
};
</script>
<body>
<div class="spacer"></div>
<div class="container"><div class="fixed"></div></div>
<div class="container inline"><div class="fixed"></div></div>

chromium/third_party/blink/web_tests/fast/css/containment/paint-containment-with-fixed-position-scrolled.html