[AspectRatio] Add a test for <picture>

<picture> does not currently let you specify an aspect ratio per source: w3c/csswg-drafts#5212 whatwg/html#4968 So this just tests setting a single aspect-ratio on the <img> element for now. Bug: 1045668 Change-Id: I89f5132322f8131bf346ea663b889e3b1d740e7c
web-platform-tests · Jun 19, 2020 · 8588e19 · 8588e19
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diff --git a/css/css-sizing/aspect-ratio/replaced-element-012.tentative.html b/css/css-sizing/aspect-ratio/replaced-element-012.tentative.html
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+<!DOCTYPE html>
+<title>CSS aspect-ratio: picture</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<picture>
+  <source srcset="support/20x50-green.png">
+  <img style="width: 100px; aspect-ratio: 1/1;">
+</picture>
+