css/css-mixins/function-shadow-animations.html

<!DOCTYPE html>
<title>Custom Functions: ShadowDOM (animations)</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1/#using-custom-functions">
<link rel="help" href="https://drafts.csswg.org/css-scoping-1/#css-tree-scoped-reference">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>

<style>
  @property --length {
    syntax: "<length>";
    inherits: false;
    initial-value: 0px;
  }

  @function --from() { result: 1000px; }
  @function --to() { result: 2000px; }
</style>

<div id=can_animate_standard_property_in_shadow>
  <template shadowrootmode=open>
    <style>
      @keyframes --anim {
        from { width: --from(); }
        to { width: --to(); }
      }
      @function --from() { result: 0px; }
      @function --to() { result: 100px; }
      div {
        animation: --anim 1000s linear paused forwards;
      }
      #t00 { animation-delay: 0s; }
      #t04 { animation-delay: -400s; }
      #t05 { animation-delay: -500s; }
      #t06 { animation-delay: -600s; }
      #t10 { animation-delay: -1000s; }
    </style>
    <div id=t00></div>
    <div id=t04></div>
    <div id=t05></div>
    <div id=t06></div>
    <div id=t10></div>
  </template>
</div>
<script>
  test(() => {
    let sr = can_animate_standard_property_in_shadow.shadowRoot;
    let gCS = (id) => getComputedStyle(sr.querySelector(id))
    assert_equals(gCS('#t00').width, '0px');
    assert_equals(gCS('#t04').width, '40px');
    assert_equals(gCS('#t05').width, '50px');
    assert_equals(gCS('#t06').width, '60px');
    assert_equals(gCS('#t10').width, '100px');
  }, 'Can animate standard property in shadow');
</script>

<div id=can_animate_typed_custom_property_in_shadow>
  <template shadowrootmode=open>
    <style>
      @keyframes --anim {
        from { --length: --from(); }
        to { --length: --to(); }
      }
      @function --from() { result: 0px; }
      @function --to() { result: 100px; }
      div {
        animation: --anim 1000s linear paused forwards;
      }
      #t00 { animation-delay: 0s; }
      #t04 { animation-delay: -400s; }
      #t05 { animation-delay: -500s; }
      #t06 { animation-delay: -600s; }
      #t10 { animation-delay: -1000s; }
    </style>
    <div id=t00></div>
    <div id=t04></div>
    <div id=t05></div>
    <div id=t06></div>
    <div id=t10></div>
  </template>
</div>
<script>
  test(() => {
    let sr = can_animate_typed_custom_property_in_shadow.shadowRoot;
    let gCS = (id) => getComputedStyle(sr.querySelector(id))
    assert_equals(gCS('#t00').getPropertyValue('--length'), '0px');
    assert_equals(gCS('#t04').getPropertyValue('--length'), '40px');
    assert_equals(gCS('#t05').getPropertyValue('--length'), '50px');
    assert_equals(gCS('#t06').getPropertyValue('--length'), '60px');
    assert_equals(gCS('#t10').getPropertyValue('--length'), '100px');
  }, 'Can animate typed custom property in shadow');
</script>

<div id=can_animate_untyped_custom_property_in_shadow>
  <template shadowrootmode=open>
    <style>
      @keyframes --anim {
        from { --untyped: --from(); }
        to { --untyped: --to(); }
      }
      @function --from() { result: 0px; }
      @function --to() { result: 100px; }
      div {
        animation: --anim 1000s linear paused forwards;
      }
      #t00 { animation-delay: 0s; }
      #t04 { animation-delay: -400s; }
      #t05 { animation-delay: -500s; }
      #t06 { animation-delay: -600s; }
      #t10 { animation-delay: -1000s; }
    </style>
    <div id=t00></div>
    <div id=t04></div>
    <div id=t05></div>
    <div id=t06></div>
    <div id=t10></div>
  </template>
</div>
<script>
  test(() => {
    let sr = can_animate_untyped_custom_property_in_shadow.shadowRoot;
    let gCS = (id) => getComputedStyle(sr.querySelector(id))
    assert_equals(gCS('#t00').getPropertyValue('--untyped'), '0px');
    assert_equals(gCS('#t04').getPropertyValue('--untyped'), '0px');
    assert_equals(gCS('#t05').getPropertyValue('--untyped'), '100px');
    assert_equals(gCS('#t06').getPropertyValue('--untyped'), '100px');
    assert_equals(gCS('#t10').getPropertyValue('--untyped'), '100px');
  }, 'Can animate untyped custom property in shadow');
</script>