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chromium/third_party/blink/web_tests/paint/invalidation/text-emphasis-h.html 

<script src="../../resources/ahem.js"></script>
<body style="-webkit-font-smoothing: none; position: relative;">
<div style="color: red; font: 16px Ahem; padding-top: 8px;">
    222222222222<br><br>
    222222222222<br><br>
    222222222222<br><br>
    222222222222
</div>
<div style="-webkit-writing-mode: vertical-lr; font: 32px Ahem; color: green; position: absolute; top: 0; left: 0;">
    <div style="-webkit-text-emphasis: 'm';">
        1111
    </div>
    <div style="-webkit-text-emphasis: 'm'; -webkit-text-emphasis-position: under left;">
        1111
    </div>

    <div style="-webkit-writing-mode: vertical-rl; -webkit-text-emphasis: 'm';">
        1111
    </div>
    <div style="-webkit-writing-mode: vertical-rl; -webkit-text-emphasis: 'm'; -webkit-text-emphasis-position: under left;">
        1111
    </div>
</div>