scroll-start-target-with-hash-fragment-navigation.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-snap-2/scroll-start-target/scroll-start-target-with-hash-fragment-navigation.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

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

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

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

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

</head>

<body>

  <iframe id="frame" src="scroll-start-target-with-fragment-navigation-inner-frame.html#fragment_target"

    onload="runTest()"></iframe>

  <script>

    function runTest() {

      test((t) => {

        let scroller = frame.contentDocument.scrollingElement;

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

        // fully scrolled down to bring it into view (despite middle_box being

        // the scroll-start-target).

        let expected_scroll_top = scroller.scrollHeight - scroller.clientHeight;

        // The scroll-start-target is just below top_box which has a height of

        // 60vh.

        const scroll_start_target_top = 0.6 * frame.contentWindow.innerHeight;

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

        assert_not_equals(scroll_start_target_top, expected_scroll_top);

        assert_equals(frame.contentDocument.scrollingElement.scrollTop,

          expected_scroll_top);

      }, "scroll-start-target does not override hash fragment navigation");

  </script>

</body>