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<!doctype html>
<meta charset="utf-8">
<title>Test for zoom restoration when coming from the bfcache</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
<script>
SimpleTest.waitForExplicitFinish();
const originalDPR = window.devicePixelRatio;
let loadCount = 0;
let childWin;
function handlePageShow(persisted) {
ok(typeof persisted == "boolean", "Should get the persisted state from the pageshow event");
is(persisted, loadCount == 2, "Should've gone into the bfcache after the back navigation");
if (loadCount == 0) {
loadCount++;
is(childWin.devicePixelRatio, originalDPR, "No zoom")
childWin.document.querySelector("a").click(); // navigate away
} else if (loadCount == 1) {
loadCount++;
is(childWin.devicePixelRatio, originalDPR, "No zoom (yet)")
is(childWin.document.querySelector("iframe").contentWindow.devicePixelRatio, originalDPR, "No zoom on frame either");
SpecialPowers.setFullZoom(childWin, 2);
childWin.requestAnimationFrame(() => childWin.requestAnimationFrame(() => {
is(childWin.devicePixelRatio, originalDPR * 2, "Zoomed");
is(childWin.document.querySelector("iframe").contentWindow.devicePixelRatio, originalDPR * 2, "Zoomed iframe too");
childWin.history.back();
}));
} else {
is(childWin.devicePixelRatio, originalDPR * 2, "Should preserve zoom when restored");
todo_is(childWin.document.querySelector("iframe").contentWindow.devicePixelRatio, originalDPR * 2, "Should preserve zoom on frames too");
childWin.close();
SimpleTest.finish();
}
}
childWin = window.open('file_zoom_restore_bfcache.html', '_blank');
</script>
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