1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/sizes-auto-rendering.html b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/sizes-auto-rendering.html
new file mode 100644
index 0000000000..e972f69c20
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/sizes/sizes-auto-rendering.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>Auto sizes rendering</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/images.html#sizes-attributes">
+<link rel="match" href="reference/sizes-auto-rendering-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+<img
+  id="testImg"
+  loading="lazy"
+  sizes="auto"
+  width="33"
+  height="13"
+>
+<script>
+  function imageLoaded() {
+    waitForAtLeastOneFrame().then(takeScreenshot);
+  }
+
+  testImg.addEventListener('load', imageLoaded);
+  testImg.setAttribute('srcset', `
+    /images/fail.gif 10w,
+    /images/green.png 100w,
+    /images/red.png 1000w
+  `);
+</script>