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<!DOCTYPE html>
<meta charset=utf-8>
<script src="imgutils.js"></script>
<img id="img" src="animated1.gif">
<script>
let observer = new ImageDecoderObserverStub();
observer.decodeComplete = () => {
parent.postMessage("decodeComplete", "*");
};
observer.loadComplete = () => {
parent.postMessage("loadComplete", "*");
};
observer = SpecialPowers.wrapCallbackObject(observer);
const gObserver = SpecialPowers.Cc["@mozilla.org/image/tools;1"]
.getService(SpecialPowers.Ci.imgITools)
.createScriptedObserver(observer);
const img = document.getElementById("img");
SpecialPowers.wrap(img).addObserver(gObserver);
window.addEventListener("unload", () => {
SpecialPowers.wrap(img).removeObserver(gObserver);
});
</script>
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