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chromium/third_party/blink/web_tests/external/wpt/html/rendering/replaced-elements/images/input-image-content-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Input type=image with CSS content.</title>
<link rel="author" href="mailto:[email protected]">

You should see a red dot.<br>
<input type="image" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==">