reading-scroll-forces-anchoring.html

Enable keyboard shortcuts

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-anchoring/reading-scroll-forces-anchoring.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">

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

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

<style>

body { height: 1000px }

div { height: 100px }

</style>

<div id="block1">abc</div>

<div id="block2">def</div>

<script>

  // This test verifies that reading window.scrollY forces any pending scroll

  // anchoring adjustment to occur before computing the return value.

  async_test((t) => {

    scrollTo(0, 150);

    requestAnimationFrame(() => {

      step_timeout(() => {

        // Queue scroll anchoring adjustment.

        document.querySelector("#block1").style.height = "200px";

        // Reading scrollY should force both the layout and the adjustment to

        // occur synchronously.

        var y = scrollY;

        assert_equals(y, 250);

        t.done();

      }, 0);

});

  }, 'Reading scroll position forces scroll anchoring adjustment.');

</script>