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<html style="overflow:hidden">
<meta charset="utf-8">
<meta name="viewport" content="width=width-device; initial-scale=1.0">
<title>Test for bug 1280013</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript">
async function test() {
ok(screen.height > 500, "Screen height must be at least 500 pixels for this test to work");
// Scroll down to the iframe. Do it in two drags instead of one in case the
// device screen is short.
let transformEnd = promiseTransformEnd();
await synthesizeNativeTouchDrag(window, 10, 200, 0, -175);
await transformEnd;
transformEnd = promiseTransformEnd();
await synthesizeNativeTouchDrag(window, 10, 200, 0, -175);
await transformEnd;
// Now the top of the visible area should be at y=350 of the top-level page,
// so if the screen is >= 500px tall, the entire iframe should be visible, at
// least vertically.
// However, because of the overflow:hidden on the root elements, all this
// scrolling is happening in APZ and is not reflected in the main-thread
// scroll position (it is stored in the callback transform instead). We check
// this by checking the scroll offset.
await promiseOnlyApzControllerFlushed();
is(window.scrollY, 0, "Main-thread scroll position is still at 0");
// Scroll the iframe by 150px.
var subframe = document.getElementById("subframe");
transformEnd = promiseTransformEnd();
await synthesizeNativeTouchDrag(subframe, 10, 100, 0, -150);
await transformEnd;
// Flush any pending paints on the APZ side, and wait for the main thread
// to process them all so that we get the correct test data
await promiseApzFlushedRepaints();
// get the displayport for the subframe
var utils = SpecialPowers.getDOMWindowUtils(window);
var contentPaints = utils.getContentAPZTestData().paints;
var lastPaint = convertScrollFrameData(getLastNonemptyBucket(contentPaints).scrollFrames);
var foundIt = 0;
for (var scrollId in lastPaint) {
if (("contentDescription" in lastPaint[scrollId]) &&
(lastPaint[scrollId].contentDescription.includes("tall_html"))) {
var dp = getPropertyAsRect(lastPaint, scrollId, "displayport");
ok(dp.y <= 0, "The displayport top should be less than or equal to zero to cover the visible part of the subframe; it is " + dp.y);
ok(dp.y + dp.height >= subframe.clientHeight, "The displayport bottom should be greater than the clientHeight; it is " + (dp.y + dp.height));
is(foundIt, 1, "Found exactly one displayport for the subframe we were interested in.");
.then(subtestDone, subtestFailed);
<body style="overflow:hidden">
The iframe below is at (0, 400). Scroll it into view, and then scroll the contents. The content should be fully rendered in high-resolution.
<iframe id="subframe" style="position:absolute; left: 0px; top: 400px; width: 300px; height: 175px" src="helper_tall.html"></iframe>