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<!doctype html>
<meta charset="utf-8">
<title>
Test for bug 1545516: We don't flush layout unnecessarily on the parent
document when the frame is already disconnected.
</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<div id="content"></div>
<script>
SimpleTest.waitForExplicitFinish();
const iframe = document.createElement("iframe");
const content = document.querySelector("#content");
const parentUtils = SpecialPowers.getDOMWindowUtils(window);
iframe.onload = function() {
const win = iframe.contentWindow;
iframe.offsetTop; // flush layout
content.style.display = "inline"; // Dirty style with something that will reframe.
const previousConstructCount = parentUtils.framesConstructed;
let pagehideRan = false;
win.addEventListener("pagehide", function() {
pagehideRan = true;
win.foo = win.innerWidth;
is(parentUtils.framesConstructed, previousConstructCount, "innerWidth shouldn't have flushed parent document layout")
win.bar = win.document.documentElement.offsetHeight;
is(parentUtils.framesConstructed, previousConstructCount, "offsetHeight shouldn't have flushed parent document layout")
win.baz = win.getComputedStyle(win.document.documentElement).color;
is(parentUtils.framesConstructed, previousConstructCount, "getComputedStyle shouldn't have flushed parent document layout")
});
iframe.remove(); // Remove the iframe
is(pagehideRan, true, "pagehide handler should've ran");
is(parentUtils.framesConstructed, previousConstructCount, "Nothing should've flushed the parent document layout yet");
content.offsetTop;
isnot(parentUtils.framesConstructed, previousConstructCount, "We should've flushed layout now");
SimpleTest.finish();
};
document.body.appendChild(iframe);
</script>