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<!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>
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