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+<!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>