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

<!DOCTYPE html>
<div style="width: 20px; height: 20px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectA">A</div>
<div style="width: 20px; height: 20px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectB">B</div>
<div style="width: 20px; height: 20px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectC">C</div>
<div style="width: 20px; height: 20px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectD">D</div>
<div style="width: 20px; height: 20px; background: lightgray; display: inline-block; margin: 10px" tabindex="0" aria-label="rectE">E</div>