anchor-scope-dynamic.html | Explore in Territory

<!DOCTYPE html>
<title>CSS Anchor Positioning: anchor-scope appearing/disappearing dynamically</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-scope">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .scope-all { anchor-scope: all; }
  .scope-a { anchor-scope: --a; }
  .scope-b { anchor-scope: --b; }
  .scope-ab { anchor-scope: --a, --b; }

  .anchor-a { anchor-name: --a; }
  .anchor-b { anchor-name: --b; }
  .anchor-a, .anchor-b {
    background: skyblue;
    height: 10px;
  }

  .anchored-a { position-anchor: --a; }
  .anchored-b { position-anchor: --b; }
  .anchored-a, .anchored-b {
    position: absolute;
    top: anchor(bottom);
    left: anchor(left);
    width: 5px;
    height: 5px;
    background: coral;
  }

  /* Containing block */
  main {
    position: relative;
    width: 100px;
    height: 100px;
    border: 1px solid black;
  }
</style>
<script>
  function inflate(t, template_element) {
    if (!template_element.hasAttribute('debug')) {
      t.add_cleanup(() => main.replaceChildren());
    }
    main.append(template_element.content.cloneNode(true));
  }
</script>

<main id=main>
</main>

<template id=test_scope_all_dynamic>
  <div class=anchor-a></div>
  <div class=anchor-a></div><!--A (after change)-->
  <div id=dynamic>
    <div class=anchor-a></div>
    <div class=anchor-a></div><!--A (initially)-->
  </div>
  <div class=anchored-a></div>
</template>
<script>
  test((t) => {
    inflate(t, test_scope_all_dynamic);
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    dynamic.style.anchorScope = 'all';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '20px');
    dynamic.style.anchorScope = '';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
  }, 'anchor-scope:all appearing dynamically');
</script>

<template id=test_scope_named_dynamic>
  <div class=anchor-a></div>
  <div class=anchor-a></div><!--A (after change)-->
  <div id=dynamic>
    <div class=anchor-a></div>
    <div class=anchor-a></div><!--A (initially)-->
  </div>
  <div class=anchored-a></div>
</template>
<script>
  test((t) => {
    inflate(t, test_scope_named_dynamic);
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    dynamic.style.anchorScope = '--a';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '20px');
    dynamic.style.anchorScope = '';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
  }, 'anchor-scope:--a appearing dynamically');
</script>

<template id=test_scope_named_unrelated_dynamic>
  <div class=anchor-a></div>
  <div class=anchor-a></div><!--A (after change)-->
  <div id=dynamic>
    <div class=anchor-a></div>
    <div class=anchor-a></div><!--A (initially)-->
  </div>
  <div class=anchored-a></div>
</template>
<script>
  test((t) => {
    inflate(t, test_scope_named_unrelated_dynamic);
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    dynamic.style.anchorScope = '--b';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    dynamic.style.anchorScope = '';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
  }, 'anchor-scope:--b appearing dynamically (--b never referenced)');
</script>

<template id=test_scope_a_dynamic>
  <div class=anchor-b></div>
  <div class=anchor-a></div><!--A (after change)-->
  <div id=dynamic>
    <div class=anchor-b></div><!--B-->
    <div class=anchor-a></div><!--A (initially)-->
  </div>
  <div class=anchored-a></div>
  <div class=anchored-b></div>
</template>
<script>
  test((t) => {
    inflate(t, test_scope_a_dynamic);
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    assert_equals(getComputedStyle(main.querySelector('.anchored-b')).top, '30px');
    dynamic.style.anchorScope = '--a';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '20px');
    assert_equals(getComputedStyle(main.querySelector('.anchored-b')).top, '30px');
    dynamic.style.anchorScope = '';
    assert_equals(getComputedStyle(main.querySelector('.anchored-a')).top, '40px');
    assert_equals(getComputedStyle(main.querySelector('.anchored-b')).top, '30px');
  }, 'anchor-scope:--a appearing dynamically scopes only --a');
</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-scope-dynamic.html
