scroll-start-with-anchor-navigation.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-snap-2/scroll-start/scroll-start-with-anchor-navigation.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title> CSS Scroll Snap 2 Test: scroll-start interaction with anchor navigation</title>

  <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start">

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <script src="/html/browsers/browsing-the-web/resources/helpers.js"></script>

  <script src="/dom/events/scrolling/scroll_support.js"></script>

</head>

<body>

  <iframe id="frame" src="scroll-start-with-anchor-navigation-inner-frame.html" onload="runTest()"></iframe>

  <script>

    function runTest() {

      promise_test(async (t) => {

        let scroller = frame.contentDocument.scrollingElement;

        // anchor_target is at the bottom of the frame so the frame should be

        // fully scrolled down to bring it into view.

        let anchor_target_scrolltop = scroller.scrollHeight - scroller.clientHeight;

        let anchor_target_link = frame.contentDocument.getElementById("anchor_target_link");

        // Expect scroll offset of 100px per scroll-start.

        assert_equals(scroller.scrollTop, 100,

          "scroll-start sets initial scroll offset");

        // Scroll away from start position.

        scroller.scrollTop = 200;

        await waitForCompositorCommit();

        assert_equals(scroller.scrollTop, 200,

          "scroll-start sets initial scroll offset");

        anchor_target_link.click();

        await waitForHashchange(frame.contentWindow);

        assert_equals(frame.contentWindow.location.hash, "#anchor_target",

          "clicking anchor link navigates to target");

        // Expect page to be fully scrolled as anchor_target is at the bottom of

        // the document.

        assert_equals(scroller.scrollTop, anchor_target_scrolltop,

          "anchor navigation sets scroll offset");

        frame.contentWindow.history.back();

        await waitForHashchange(frame.contentWindow);

        assert_equals(frame.contentWindow.location.hash, "");

        scroller = frame.contentDocument.scrollingElement;

        assert_equals(scroller.scrollTop, 200,

          "scroller returns to previous scroll position, not " +

          "scroll-start");

      }, "scroll-start does not override anchor navigation.");

  </script>

</body>