fixed-backgrounds.html | Explore in Territory

<!DOCTYPE html>
<style>
    body {
        height: 2000px;
        width: 2000px;
        overflow: hidden;
    }

    .box {
        height: 300px;
        width: 300px;
        margin: 20px;
        margin-left: 10px;
        background-image: url('../resources/alpha-blocks.png');

        background-size: 500px 300px;
        background-repeat: no-repeat;
        background-attachment: fixed;
        box-shadow: 10px 10px 0px gray; /* inflates composited bounds */
        border: 4px solid gray;
        float: left;
    }

    .composited {
        will-change: opacity;
    }
</style>
<script>
    function doTest()
    {
        window.scrollTo(35, 45);
    }
    window.addEventListener('load', doTest, false);
</script>
<div class="composited box"></div>
<div class="composited box"></div>

chromium/third_party/blink/web_tests/compositing/backgrounds/fixed-backgrounds.html