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chromium/content/test/data/accessibility/hit_testing/simple_rectangles_iframe.html 

<!DOCTYPE html>
<div style="width: 5px; height: 5px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectA"></div>
<div style="width: 5px; height: 5px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectB"></div>
<div style="width: 5px; height: 5px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectC"></div>
<div style="width: 5px; height: 5px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectD"></div>
<div style="width: 5px; height: 5px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectE"></div>