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<!DOCTYPE html>
<script>
var width, url;
function maybeReport() {
if (width !== undefined && url !== undefined) {
window.parent.postMessage({status: "result",
width: width,
url: url}, "*");
}
}
onload = function() {
width = document.querySelector("img").width;
maybeReport();
};
navigator.serviceWorker.onmessage = function(event) {
url = event.data;
maybeReport();
};
</script>
<img src="image-20px.png">
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