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Test Info:
<!DOCTYPE html>
<html>
<body>
<div style="writing-mode: vertical-rl;"><div><span style="display: flex;">x</span></div>y</div>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<div style="writing-mode: vertical-rl;"><div><span style="display: flex;">x</span></div>y</div>
</body>
</html>