author Robert Longson <>
Sat, 04 Feb 2023 15:41:48 +0000
changeset 651752 40237e7707f1928c84d09cdd2f1fd018a74ea784
parent 622589 3c1b912da04479f347a04854bac6be21f57e0d30
permissions -rw-r--r--
Bug 1814872 - Fix degenerate radial gradient handling r=emilio This is a change from SVG 1.1 where we only had to check for r=0 because fr did not exist. The SVG 2 behaviour was clarified in Differential Revision:

  <title>Test APZ hit-testing while overscrolled</title>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
  <meta name="viewport" content="width=device-width"/>
    html, body {
      margin: 0;
      padding: 0;
    #subframe {
      width: 100px;
      height: 100px;
      overflow: scroll;
    .spacer {
      height: 5000px;
    #target {
      margin-left: 20px;
      margin-top: 2px;
      height: 4px;
      width: 4px;
      background: red;
 <div id="subframe">
   <div id="target"></div>
   <div class="spacer"></div>
 <div class="spacer"></div>
<script type="application/javascript">

async function test() {
  var config = getHitTestConfig();
  var utils = config.utils;

  // Subframe hit testing of overscrolled APZCs does not yet work with WebRender
  // (bug 1701831), so bail out early.
  if (true) {
    todo(false, "This test does not currently pass with WebRender");

  // Activate the subframe. This both matches reality (if you're
  // scrolling the subframe, it's active), and makes it easier
  // to check for expected hit test outcomes.
  utils.setDisplayPortForElement(0, 0, 500, 500, subframe, 1);
  await promiseApzFlushedRepaints();

  // Overscroll the subframe at the top, creating a gutter.
  // Note that the size of the gutter will only be 8px, because
  // setAsyncScrollOffset() applies the overscroll as a single delta,
  // and current APZ logic that transforms a delta into an overscroll
  // amount limits each delta to at most 8px.
  utils.setAsyncScrollOffset(subframe, 0, -200);

  // Check that the event hits the subframe frame in APZ.
  // This is important because additional pan-gesture events in the gutter
  // should continue to be handled and cause further overscroll (or
  // relieving overscroll, depending on their direction).
  let subframeBounds = subframe.getBoundingClientRect();
  hitResult = hitTest({
    x: subframeBounds.x + 50,
    y: subframeBounds.y + 4
  let subframeViewId = utils.getViewId(subframe);
                 "APZ hit-test in the subframe gutter");

  // Now, perform a click in the gutter and check that APZ prevents
  // the event from reaching Gecko.
  // To be sure that no event was dispatched to Gecko, install the listener
  // on the document, not the subframe.
  // This makes sure we catch the case where the overscroll transform causes
  // the event to incorrectly target the document.
  let receivedClick = false;
  let listener = function(e) {
    receivedClick = true;
  document.addEventListener("click", listener);
  await synthesizeNativeMouseEventWithAPZ({
    type: "click",
    target: subframe,
    offsetX: 50,
    offsetY: 4
  // Wait 10 frames for the event to maybe arrive, and if it
  // hasn't, assume it won't.
  for (let i = 0; i < 10; i++) {
    await promiseFrame();
  info("Finished waiting around for click event");
  ok(!receivedClick, "Gecko received click event when it shouldn't have");
  document.removeEventListener("click", listener);

  // Finally, while still overscrolled, perform a click not in the gutter.
  // This event should successfully go through to the web content, and
  // be untransformed by the overscroll transform (such that it hits the
  // content that is visually under the cursor).
  let clickPromise = new Promise(resolve => {
    document.addEventListener("click", function(e) {
      info("event clientX = " + e.clientX);
      info("event clientY = " + e.clientY);
      is(, target, "Click while overscrolled hit intended target");
    }, { once: true });
  await synthesizeNativeMouseEventWithAPZ({
    type: "click",
    target: window,
    offsetX: 22,
    offsetY: 12
  await clickPromise;

.then(subtestDone, subtestFailed);