<!DOCTYPE html>
<meta charset="utf-8">
<title>Input type=image with CSS content.</title>
<link rel="author" href="mailto:masonf@chromium.org">

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