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Test Info:
<!DOCTYPE HTML>
<style>
html { writing-mode: vertical-lr; text-orientation: sideways-right; }
#outer { width: 450px; }
#inner { font-size: 12px; width: 100%; height: 100%; }
</style>
<div id="outer">
<div id="inner">Inflated?
<script>
// When AccessibleCaret is enabled, the above markup is sufficient to trigger
// the assertion on the custom content container. This script forces
// AccessibleCaret to show, and tests that font inflation doesn't trigger
// assertion for elements in the custom content container subtree.
var sel = window.getSelection();
sel.selectAllChildren(document.documentElement);
document.documentElement.offsetWidth;
sel.removeAllRanges();
</script>