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diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/decode/image-decode.html b/testing/web-platform/tests/html/semantics/embedded-content/the-img-element/decode/image-decode.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<meta name="timeout" content="long">
+<title>HTMLImageElement.prototype.decode(), basic tests.</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<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>
+
+<script>
+"use strict";
+
+// src tests
+// -------------------
+promise_test(function() {
+  var img = new Image();
+  img.src = "/images/green.png";
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Image with PNG src decodes with undefined.");
+
+promise_test(function() {
+  var img = new Image();
+  img.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAA" +
+            "D91JpzAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4QUSEioKsyAgyw" +
+            "AAABl0RVh0Q29tbWVudABDcmVhdGVkIHdpdGggR0lNUFeBDhcAAAAWSURBVA" +
+            "jXY9y3bx8DAwPL58+fGRgYACktBRltLfebAAAAAElFTkSuQmCC";
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Image with PNG data URL src decodes with undefined.");
+
+promise_test(function() {
+  var img = new Image();
+  img.src = "/images/green.svg";
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Image with SVG src decodes with undefined.");
+
+promise_test(function(t) {
+  var img = new Image();
+  img.src = "/non/existent/path.png";
+  var promise = img.decode();
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Non-existent src fails decode.");
+
+promise_test(function(t) {
+  var inactive_doc = document.implementation.createHTMLDocument();
+  var img = inactive_doc.createElement("img");
+  img.src = "/images/green.png";
+  var promise = img.decode();
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Inactive document fails decode.");
+
+promise_test(function(t) {
+  var inactive_doc = document.implementation.createHTMLDocument();
+  var img = document.createElement("img");
+  img.src = "/images/green.png";
+  var promise = img.decode();
+  inactive_doc.body.appendChild(img);
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Adopted active image into inactive document fails decode.");
+
+promise_test(function() {
+  var inactive_doc = document.implementation.createHTMLDocument();
+  var img = inactive_doc.createElement("img");
+  img.src = "/images/green.png";
+  document.body.appendChild(img);
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Adopted inactive image into active document succeeds.");
+
+promise_test(function(t) {
+  var img = new Image();
+  img.src = "data:image/png;base64,iVBO00PDR0BADBEEF00KGg";
+  var promise = img.decode();
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Corrupt image in src fails decode.");
+
+promise_test(function(t) {
+  var img = new Image();
+  var promise = img.decode();
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Image without src/srcset fails decode.");
+
+promise_test(function() {
+  var img = new Image();
+  img.src = "/images/green.png";
+  var first_promise = img.decode();
+  var second_promise = img.decode();
+  assert_not_equals(first_promise, second_promise);
+  return Promise.all([
+    first_promise,
+    second_promise
+  ]);
+}, document.title + " Multiple decodes for images with src succeed.");
+
+// srcset tests
+// -------------------
+promise_test(function() {
+  var img = new Image();
+  img.srcset = "/images/green.png 100w";
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Image with PNG srcset decodes with undefined.");
+
+promise_test(function() {
+  var img = new Image();
+  img.srcset = "/images/green.svg 100w";
+  return img.decode().then(function(arg) {
+    assert_equals(arg, undefined);
+  });
+}, document.title + " Image with SVG srcset decodes with undefined.");
+
+promise_test(function(t) {
+  var img = new Image();
+  img.srcset = "/non/existent/path.png 100w";
+  var promise = img.decode();
+  return promise_rejects_dom(t, "EncodingError", promise);
+}, document.title + " Non-existent srcset fails decode.");
+
+promise_test(function() {
+  var img = new Image();
+  img.srcset = "/images/green.png 100w";
+  var first_promise = img.decode();
+  var second_promise = img.decode();
+  assert_not_equals(first_promise, second_promise);
+  return Promise.all([
+    first_promise,
+    second_promise
+  ]);
+}, document.title + " Multiple decodes for images with srcset succeed.");
+
+</script>