author Robert Longson <>
Sat, 04 Feb 2023 15:41:48 +0000
changeset 651752 40237e7707f1928c84d09cdd2f1fd018a74ea784
parent 615259 f09731defa818bb232dd5ec9e4c1d9afd3fda518
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:

  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Test for bug 1516056: "scroll into view" respects bounds on layout scroll position</title>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
    #target {
      width: 100px;
      height: 100px;
      margin-left: 50%;
      margin-right: 50%;
      background: cyan;
  <div id="target"></div>
    let vv = window.visualViewport;
    function getVisualScrollRange() {
      let rootScroller = document.scrollingElement;
      return {
        width: rootScroller.scrollWidth - vv.width,
        height: rootScroller.scrollHeight - vv.height,
    async function test() {
      is(window.scrollMaxX, 0, "page should have a zero horizontal layout scroll range");
      is(window.scrollMaxY, 0, "page should have a zero vertical layout scroll range");
      let visualScrollRange = getVisualScrollRange();
      ok(visualScrollRange.width > 0, "page should have a nonzero horizontal visual scroll range");
      ok(visualScrollRange.height > 0, "page should have a nonzero vertical visual scroll range");
      let target = document.getElementById("target");

      // Scroll target element into view. Wait until any visual scrolling is done before doing checks.
      let scrollPromise = new Promise(resolve => {
        vv.addEventListener("scroll", resolve, { once: true });
      await scrollPromise; // wait for visual viewport "scroll" event
      await promiseApzFlushedRepaints();

      // Test that scrollIntoView() respected the layout scroll range.
      is(window.scrollX, 0, "page should not layout-scroll with a zero layout scroll range");
      is(window.scrollY, 0, "page should not layout-scroll with a zero layout scroll range");

      // Test that scrollIntoView() did perform visual scrolling.
      let vvRect = getVisualViewportRect(vv);
      let targetBounds = target.getBoundingClientRect();
      assertRectContainment(vvRect, "visual viewport", targetBounds, "target element bounding rect");

    .then(subtestDone, subtestFailed);