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<!DOCTYPE html>
<meta charset="utf-8">
Iframe loading a stylesheet via a service worker
<script>
"use strict";
function waitForActive(swr) {
const sw = swr.installing || swr.waiting || swr.active;
return new Promise(resolve => {
if (sw.state === "activated") {
resolve(swr);
return;
}
sw.addEventListener("statechange", function onStateChange() {
if (sw.state === "activated") {
sw.removeEventListener("statechange", onStateChange);
resolve(swr);
}
});
});
}
navigator.serviceWorker.register("iframe_service_worker.js", {scope: "."})
.then(registration => waitForActive(registration))
.then(() => {
const link = document.createElement("link");
link.setAttribute("rel", "stylesheet");
link.setAttribute("type", "text/css");
link.setAttribute("href", "sheet.css");
document.documentElement.appendChild(link);
});
</script>