chromium/src/third_party/blink/renderer/core/testing/data/rgm_fixed_position_test.html

<style>
    div {
        border-style:solid;
        border-width:1px;
        transform:translate3d(0, 3, 0);
        position:fixed;
        padding:5px 0px;
        width:500px;
    }
</style>

<div id='InitialDiv'></div>
<div id='LongDiv' style="width:200px"></div>
<div id='CenterDiv' style="left:20px">
    <div id='InnerDiv' style="left:20px">
        <div id='OtherDiv' style="">
                Word
        </div>
    </div>
</div>