<!doctypehtml>
<script> var bcName = "zoomRestoreBfcache" + window.location.search; var bc = new BroadcastChannel(bcName);
if (window.location.search == "?2") {
bc.onmessage = (msgEvent) => { var msg = msgEvent.data; varcommand = msg.command;
dump(`Subpage ?2 received command=${command}\n`);
switch (command) {
case "case2sendData": {
bc.postMessage({command: "case2data", devicePixelRatio: window.devicePixelRatio,
frameDevicePixelRatio: document.querySelector("iframe").contentWindow.devicePixelRatio});
break;
}
case "case2action": {
SpecialPowers.spawnChrome([], () => {
const FullZoom = this.browsingContext.embedderElement.ownerGlobal.FullZoom;
FullZoom.setZoom(2.0);
});
SpecialPowers.setFullZoom(window, 2);
window.requestAnimationFrame(() => window.requestAnimationFrame(() => {
bc.postMessage({command: "case2dataAnimationFrame", devicePixelRatio: window.devicePixelRatio,
frameDevicePixelRatio: document.querySelector("iframe").contentWindow.devicePixelRatio });
}));
break;
}
case "case2back": {
bc.close();
window.history.back();
break;
}
}
}
} else {
bc.onmessage = (msgEvent) => { var msg = msgEvent.data; varcommand = msg.command;
dump(`Subpage received command=${command}\n`);
switch (command) {
case "case1sendData": {
bc.postMessage({command: "case1data", devicePixelRatio: window.devicePixelRatio});
break;
}
case "case1click": {
document.querySelector("a").click();
// We are opening file_zoom_restore_bfcache.html?2, so the current
// page is going into bfcache
break;
}
case "case3sendData": {
// We came back from bfcache
SpecialPowers.spawnChrome([], () => {
// We use FullZoom to set the zoom level in the parent, but if FullZoom is not
// available then that will fail. So we don't wait here for the devicePixelRatio
// to change if FullZoom is not available, and test_zoom_restore_bfcache.html
// will mark this test as todo.
return "FullZoom" in this.browsingContext.embedderElement.ownerGlobal;
}).then((hasFullZoom) => {
function waitUntilZoomLevelRestored() {
// Zoom level is updated asynchronously when bfcache lives in the
// parent process.
if (!hasFullZoom || window.devicePixelRatio == 2) {
bc.postMessage({command: "case3data", devicePixelRatio: window.devicePixelRatio,
frameDevicePixelRatio: document.querySelector("iframe").contentWindow.devicePixelRatio});
return;
}
window.requestAnimationFrame(waitUntilZoomLevelRestored);
}
window.requestAnimationFrame(waitUntilZoomLevelRestored);
});
break;
}
case "close": {
SpecialPowers.spawnChrome([], () => {
const FullZoom = this.browsingContext.embedderElement.ownerGlobal.FullZoom;
FullZoom.setZoom(1.0);
});
bc.postMessage({command: "closed"});
bc.close();
window.close();
break;
}
}
}
}
window.addEventListener("pageshow", function(e) {
bc.postMessage({command: "handlePageShow", eventPersisted: e.persisted});
});
</script>
<a href="?2">This is a very interesting page</a>
<iframe srcdoc="And this is a nested frame"></iframe>
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.19 Sekunden
(vorverarbeitet am 2026-06-05)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.
