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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-transition-mismatched-property-numbers.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="target"></div>
<script>

test(() => {
    const customProperty = generate_name();
    CSS.registerProperty({
      name: customProperty,
      syntax: "<number>",
      inherits: false,
      initialValue: "1"
    });

    // Create transitions for our custom property with
    // a longer list of transition-duration values.
    const target = document.getElementById("target");
    target.style.transitionProperty = customProperty;
    target.style.transitionDuration = "100s, 200s";

    // Trigger a style change by getting the custom property
    // value from the computed style.
    getComputedStyle(target).getPropertyValue(customProperty);

    // Set a new value for the custom property, which will yield a
    // transition.
    target.style.setProperty(customProperty, "2");
    const animations = target.getAnimations();
    assert_equals(animations.length, 1, "A single transition was generated");

    const transition = animations[0];
    assert_class_string(transition, "CSSTransition", "A CSSTransition is running");
    assert_equals(transition.transitionProperty, customProperty);
}, 'Using a single "transition-property" value set to a custom property and two "transition-duration" values correctly yields a CSS Transition.');

</script>