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<!DOCTYPE HTML>
<html id="rcd_docelement">
<head>
<meta charset="utf-8">
<title>Test that large OOPIF does not get a too-large displayport</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script src="helper_fission_utils.js"></script>
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<script>
fission_subtest_init();
FissionTestHelper.startTestPromise
.then(waitUntilApzStable)
.then(loadOOPIFrame("testframe", "helper_fission_empty.html"))
.then(waitUntilApzStable)
.then(test)
.then(FissionTestHelper.subtestDone, FissionTestHelper.subtestFailed);
// Code that will run inside the iframe.
let get_iframe_displayport = function() {
// Give the page a scroll range. This will make the unclamped displayport
// even taller.
document.body.style.height = "200vh";
// Do a round-trip to APZ to make sure the scroll range is reflected
// in the displayport it sets.
promiseApzFlushedRepaints().then(() => {
// Query the composed displayport and report it to the embedder.
let result = getLastContentDisplayportFor("fission_empty_docelement");
FissionTestHelper.fireEventInEmbedder("OOPIF:Displayport", result);
});
return true;
};
async function test() {
let iframeElement = document.getElementById("testframe");
// Give the page a scroll range and make sure APZ sets non-empty displayport margins.
document.body.style.height = "500vh";
await promiseApzFlushedRepaints();
// Query the iframe's displayport.
let displayportPromise = promiseOneEvent(window, "OOPIF:Displayport", null);
ok(await FissionTestHelper.sendToOopif(iframeElement, `(${get_iframe_displayport})()`), "Gotten iframe displayport");
let iframeDp = (await displayportPromise).data;
dump("iframe displayport is " + JSON.stringify(iframeDp) + "\n");
// Query the page's displayport.
let dp = getLastContentDisplayportFor("rcd_docelement");
dump("page displayport is " + JSON.stringify(dp) + "\n");
// Check that the iframe's displayport is no more than twice as tall as
// the page's displayport. The reason it can be up to twice as tall is
// described in bug 1690697; we may be able to assert a tighter bound
// after making improvements in that bug.
ok(iframeDp.height <= (dp.height * 2), "iframe displayport should be no more than twice as tall as page displayport");
}
</script>
</head>
<body>
<!-- Make the iframe's viewport very tall -->
<iframe style="margin-top: 200px" id="testframe" height="10000px"></iframe>
</body>
</html>
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