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<!DOCTYPE html>
<meta charset=utf-8>
<meta name="timeout" content="long">
<title>SVGImageElement.prototype.decode(), attach to DOM before promise resolves.</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>
<svg></svg>
<script>
"use strict";
promise_test(function() {
var img = document.createElementNS('http://www.w3.org/2000/svg', 'image');
img.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', "/images/green.png");
const promise = img.decode().then(function(arg) {
assert_equals(arg, undefined);
});
// Don't wait for the promise to resolve before attaching the image.
// The promise should still resolve successfully.
document.querySelector('svg').appendChild(img);
return promise;
}, document.title);
</script>
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