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<!DOCTYPE html>
<script>
var width, url, width2, url2;
function maybeReport() {
if (width !== undefined && url !== undefined &&
width2 !== undefined && url2 !== undefined) {
window.parent.postMessage({status: "result",
width,
width2,
url,
url2}, "*");
}
}
onload = function() {
width = document.querySelector("img").width;
width2 = document.querySelector("img").width;
maybeReport();
};
navigator.serviceWorker.onmessage = function(event) {
if (event.data.suffix == "2") {
url2 = event.data.url;
} else {
url = event.data.url;
}
maybeReport();
};
</script>
<img src="image.png">
<img src="image2.png">