1 files changed, 25 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/decode/image-decode-image-document.html b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/decode/image-decode-image-document.html
new file mode 100644
index 0000000000..e54ae223a0
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/decode/image-decode-image-document.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>HTMLImageElement.prototype.decode(), image document tests.</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-decode">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe id="frame_imgdoc" src="about:blank"></iframe>
+<script>
+"use strict";
+
+promise_test(function() {
+  return new Promise(function(resolve) {
+    var frame = document.getElementById("frame_imgdoc");
+    // Load an image in the iframe and then replace that.
+    frame.src = "/images/red.png";
+    frame.onload = function() {
+      let img = frame.contentDocument.body.firstElementChild;
+      img.src = "/images/green.png";
+      img.decode().then(function() {
+        resolve();
+      });
+    };
+  });
+}, document.title + " Decode from iframe with image document, succeeds (img not loaded)");
+</script>
+