LayoutTests/fast/text/text-combine-shrink-on-color-change.html

<div id="change" style="
    height: 200px;
    -webkit-writing-mode: vertical-lr;
    font-family: HiraMinProN-W3;
    font-size: 36px;
">
    1 <span id="target" style="-webkit-text-combine: horizontal;">123456</span> 2
</div>
<script>
document.body.offsetLeft;
document.getElementById('change').style.color='green';
document.body.offsetLeft;
</script>