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diff --git a/testing/web-platform/tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/video-aspect-ratio.html b/testing/web-platform/tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/video-aspect-ratio.html
new file mode 100644
index 0000000000..119523d250
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/video-aspect-ratio.html
@@ -0,0 +1,72 @@
+<!doctype html>
+<title>Video width and height attributes are used to infer aspect-ratio</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/media.js"></script>
+<script src="resources/aspect-ratio.js"></script>
+<style>
+  video {
+    width: 100%;
+    max-width: 100px;
+    height: auto;
+  }
+</style>
+<body>
+<video width="250" height="100" id="contained" style="contain: size;"></video>
+<script>
+function assert_ratio(img, expected) {
+  let epsilon = 0.001;
+  assert_approx_equals(parseInt(getComputedStyle(img).width, 10) / parseInt(getComputedStyle(img).height, 10), expected, epsilon);
+}
+
+function test_computed_style(width, height, expected) {
+  test_computed_style_aspect_ratio("video", {width: width, height: height}, expected);
+}
+
+promise_test(async function() {
+  {
+    let video = document.getElementById("contained");
+    video.src = getVideoURI('/media/2x2-green');
+    assert_ratio(video, 2.5, "contain:size aspect ratio");
+  }
+
+  // Create and append a new video and immediately check the ratio.
+  // This is not racy because the spec requires the user agent to queue a task:
+  // https://html.spec.whatwg.org/multipage/media.html#concept-media-load-algorithm
+  {
+    let video = document.createElement("video");
+    video.setAttribute("width", "250");
+    video.setAttribute("height", "100");
+    video.src = getVideoURI('/media/2x2-green');
+    document.body.appendChild(video);
+    assert_ratio(video, 2.5, "aspect ratio for regular video before load");
+    await new Promise(r => video.addEventListener("loadeddata", r, { once: true }));
+    // When loaded this video is square.
+    assert_ratio(video, 1, "aspect ratio for regular video after load");
+  }
+
+  // Same but with auto width.
+  {
+    let video = document.createElement("video");
+    video.setAttribute("width", "250");
+    video.setAttribute("height", "100");
+    video.style.width = "auto";
+    video.src = getVideoURI('/media/2x2-green');
+    document.body.appendChild(video);
+    assert_ratio(video, 2.5, "aspect ratio for regular video with width: auto before load");
+    await new Promise(r => video.addEventListener("loadeddata", r, { once: true }));
+    assert_ratio(video, 1, "aspect ratio for regular video with width: auto after load");
+  }
+
+  test_computed_style("10", "20", "auto 10 / 20");
+  test_computed_style("0.5", "1.5", "auto 0.5 / 1.5");
+  test_computed_style("0", "1", "auto 0 / 1");
+  test_computed_style("1", "0", "auto 1 / 0");
+  test_computed_style("0", "0", "auto 0 / 0");
+  test_computed_style(null, null, "auto");
+  test_computed_style("10", null, "auto");
+  test_computed_style(null, "20", "auto");
+  test_computed_style("xx", "20", "auto");
+  test_computed_style("10%", "20", "auto");
+});
+</script>