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chromium/third_party/blink/web_tests/fast/forms/validation-bubble-appearance-rtl-ui.html 

<!DOCTYPE html>
<p>Check if a validation bubble is shown at a correct position in RTL UI.</p>
<input pattern="\d{4}" title="Please specify four digits." value="abc" style="margin-left: 30%;">
<script>
internals.setUserPreferredLanguages(['ar']);
document.querySelector('input').reportValidity();
</script>