<!DOCTYPE html><title>CSS Test: mask-image: url(data:...)</title><linkrel="author"title="Mats Palmgren"href="mailto:mats@mozilla.com"><linkrel="help"href="https://drafts.fxtf.org/css-masking-1/#mask-layer-image"><linkrel="match"href="reference/mask-image-data-url-image-ref.html"><metaname="assert"content="mask-image can use a data: URL as an image"><style>#back{position:absolute;box-sizing:border-box;width:200px;height:200px;border:60pxsolidgreen;background:blue;}#front{position:absolute;box-sizing:border-box;width:200px;height:200px;border:40pxsolidblue;background:green;mask-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGDwAQAAUQBNt+pgmgAAAABJRU5ErkJggg==);/* 1x1 black with 30% transparency */}</style><p>The test passes if there is a blue-ish square with a 20px green border around it and a 40px blue-green-ish border around that.</p><divid="back"></div><divid="front"></div>