File: image-decode-image-document.html

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<!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>