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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=453650
+-->
+<window title="Mozilla Bug 453650"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+ /** Test for Bug 453650 */
+ SimpleTest.waitForExplicitFinish();
+
+ var iter = runTests();
+ nextTest();
+
+ function* runTests() {
+ var iframe = document.createXULElement("iframe");
+ iframe.style.width = "300px";
+ iframe.style.height = "300px";
+ iframe.setAttribute("src", "data:text/html,<h1 id='h'>hello</h1>");
+
+ document.documentElement.appendChild(iframe);
+ yield whenLoaded(iframe);
+ info("iframe loaded");
+
+ var h1 = iframe.contentDocument.getElementById("h");
+ let myCallback = function() { h1.style.width = "400px"; };
+ info("Calling waitForInterruptibleReflow");
+ yield waitForInterruptibleReflow(iframe.docShell, myCallback);
+ info("got past top-level waitForInterruptibleReflow");
+
+ myCallback = function() { h1.style.width = "300px"; };
+ info("Calling waitForReflow");
+ waitForReflow(iframe.docShell, myCallback);
+ info("got past top-level waitForReflow");
+ yield is(300, h1.offsetWidth, "h1 has correct width");
+
+ SimpleTest.finish();
+ }
+
+ function waitForInterruptibleReflow(docShell,
+ callbackThatShouldTriggerReflow) {
+ waitForReflow(docShell, callbackThatShouldTriggerReflow, true);
+ }
+
+ function waitForReflow(docShell, callbackThatShouldTriggerReflow,
+ interruptible = false) {
+ info("Entering waitForReflow");
+ function done() {
+ info("Entering done (inside of waitForReflow)");
+
+ docShell.removeWeakReflowObserver(observer);
+ SimpleTest.executeSoon(nextTest);
+ }
+
+ var observer = {
+ reflow (start, end) {
+ info("Entering observer.reflow");
+ if (interruptible) {
+ ok(false, "expected interruptible reflow");
+ } else {
+ ok(true, "observed uninterruptible reflow");
+ }
+
+ info("times: " + start + ", " + end);
+ ok(start <= end, "reflow start time lower than end time");
+ done();
+ },
+
+ reflowInterruptible (start, end) {
+ info("Entering observer.reflowInterruptible");
+ if (!interruptible) {
+ ok(false, "expected uninterruptible reflow");
+ } else {
+ ok(true, "observed interruptible reflow");
+ }
+
+ info("times: " + start + ", " + end);
+ ok(start <= end, "reflow start time lower than end time");
+ done();
+ },
+
+ QueryInterface: ChromeUtils.generateQI([
+ "nsIReflowObserver",
+ "nsISupportsWeakReference",
+ ]),
+ };
+
+ info("waitForReflow is adding a reflow observer");
+ docShell.addWeakReflowObserver(observer);
+ callbackThatShouldTriggerReflow();
+ }
+
+ function whenLoaded(iframe) {
+ info("entering whenLoaded");
+ iframe.addEventListener("load", function() {
+ SimpleTest.executeSoon(nextTest);
+ }, { once: true });
+ }
+
+ function nextTest() {
+ info("entering nextTest");
+ iter.next();
+ }
+
+ ]]>
+ </script>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=453650"
+ target="_blank">Mozilla Bug 453650</a>
+ </body>
+</window>