position-area-scrolling-002.tentative.html

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This test has a WPT meta file that expects 6 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-anchor-position/position-area-scrolling-002.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>position-area to include current scroll position at first layout</title>

<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">

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

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

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

<script src="support/test-common.js"></script>

<style>

  .pos {

    position: absolute;

    box-sizing: border-box;

    border: solid;

    position-anchor: --anchor;

    width: 50%;

    height: 50%;

    background: cyan;

  #container.thicker > .pos {

    border-width: thick;

</style>

<div style="position:relative; width:500px; height:500px;">

  <div id="scrollable" style="overflow:hidden; width:500px; height:500px;">

    <div style="width:1000px; height:1000px;">

      <div style="height:200px;"></div>

      <div style="anchor-name:--anchor; margin-left:200px; width:100px; height:100px; background:gray;"></div>

    </div>

  </div>

  <div id="container">

    <div id="e1" class="pos" style="position-area:top left;"></div>

    <div id="e2" class="pos" style="position-area:top center;"></div>

    <div id="e3" class="pos" style="position-area:top right;"></div>

    <div id="e4" class="pos" style="position-area:center left;"></div>

    <div id="e5" class="pos" style="position-area:center center;"></div>

    <div id="e6" class="pos" style="position-area:center right;"></div>

    <div id="e7" class="pos" style="position-area:bottom left;"></div>

    <div id="e8" class="pos" style="position-area:bottom center;"></div>

    <div id="e9" class="pos" style="position-area:bottom right;"></div>

  </div>

</div>

<script>

  function assert_rects_equal(elm, x, y, width, height) {

    assert_equals(elm.offsetLeft, x, (elm.id + " x"));

    assert_equals(elm.offsetTop, y, (elm.id + " y"));

    assert_equals(elm.offsetWidth, width, (elm.id + " width"));

    assert_equals(elm.offsetHeight, height, (elm.id + " height"));

  function assert_scroll_and_layout_at_initial() {

    assert_rects_equal(e1, 100, 100, 100, 100);

    assert_rects_equal(e2, 225, 100, 50, 100);

    assert_rects_equal(e3, 300, 100, 100, 100);

    assert_rects_equal(e4, 100, 225, 100, 50);

    assert_rects_equal(e5, 225, 225, 50, 50);

    assert_rects_equal(e6, 300, 225, 100, 50);

    assert_rects_equal(e7, 100, 300, 100, 100);

    assert_rects_equal(e8, 225, 300, 50, 100);

    assert_rects_equal(e9, 300, 300, 100, 100);

  function assert_scroll_at_40_60_layout_at_initial() {

    assert_rects_equal(e1, 60, 40, 100, 100);

    assert_rects_equal(e2, 185, 40, 50, 100);

    assert_rects_equal(e3, 260, 40, 100, 100);

    assert_rects_equal(e4, 60, 165, 100, 50);

    assert_rects_equal(e5, 185, 165, 50, 50);

    assert_rects_equal(e6, 260, 165, 100, 50);

    assert_rects_equal(e7, 60, 240, 100, 100);

    assert_rects_equal(e8, 185, 240, 50, 100);

    assert_rects_equal(e9, 260, 240, 100, 100);

  function assert_scroll_and_layout_at_40_60() {

    assert_rects_equal(e1, 80, 70, 80, 70);

    assert_rects_equal(e2, 185, 70, 50, 70);

    assert_rects_equal(e3, 260, 70, 120, 70);

    assert_rects_equal(e4, 80, 165, 80, 50);

    assert_rects_equal(e5, 185, 165, 50, 50);

    assert_rects_equal(e6, 260, 165, 120, 50);

    assert_rects_equal(e7, 80, 240, 80, 130);

    assert_rects_equal(e8, 185, 240, 50, 130);

    assert_rects_equal(e9, 260, 240, 120, 130);

  function assert_scroll_at_initial_layout_at_40_60() {

    assert_rects_equal(e1, 120, 130, 80, 70);

    assert_rects_equal(e2, 225, 130, 50, 70);

    assert_rects_equal(e3, 300, 130, 120, 70);

    assert_rects_equal(e4, 120, 225, 80, 50);

    assert_rects_equal(e5, 225, 225, 50, 50);

    assert_rects_equal(e6, 300, 225, 120, 50);

    assert_rects_equal(e7, 120, 300, 80, 130);

    assert_rects_equal(e8, 225, 300, 50, 130);

    assert_rects_equal(e9, 300, 300, 120, 130);

  promise_test(async() => {

    assert_scroll_and_layout_at_initial();

  }, "Initial scroll position");

  promise_test(async() => {

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    scrollable.scrollTo(40, 60);

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    assert_scroll_at_40_60_layout_at_initial();

  }, "Scroll to 40,60");

  promise_test(async() => {

    // As long as we're within the same animation frame (and therefore haven't

    // run ResizeObserver events), there will be no anchor recalculation point.

    container.style.display = "flow-root";

    assert_scroll_and_layout_at_initial();

    container.style.display = "none";

    document.body.offsetTop;

    container.style.display = "block";

    assert_scroll_and_layout_at_initial();

  }, "Reattach at 40,60");

  promise_test(async() => {

    container.style.display = "none";

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    container.style.display = "block";

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    assert_scroll_and_layout_at_40_60();

  }, "Redisplay at 40,60");

  promise_test(async() => {

    scrollable.scrollTo(0, 0);

    container.className = "thicker";

    container.style.display = "block";

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    assert_scroll_at_initial_layout_at_40_60();

  }, "Scroll to 0,0 and relayout");

  promise_test(async() => {

    container.style.display = "none";

    await waitUntilNextAnimationFrame();

    container.style.display = "block";

    await waitUntilNextAnimationFrame();

    await waitUntilNextAnimationFrame();

    assert_scroll_and_layout_at_initial();

  }, "Redisplay at 0,0");

</script>