<!-- quirks mode -->
<body style="font-size: 15px; line-height: 11px;">
a
<span>
<br style="writing-mode: vertical-lr;">
<div style="display: inline-block; width: 10px; height: 10px; background: lightblue;"></div>
</span>
</body>
<!-- quirks mode -->
<body style="font-size: 15px; line-height: 11px;">
a
<span>
<br style="writing-mode: vertical-lr;">
<div style="display: inline-block; width: 10px; height: 10px; background: lightblue;"></div>
</span>
</body>