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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://issues.chromium.org/issues/394133544">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<select>
<option>option</option>
</select>
<style>
select, ::picker(select) {
appearance: base-select;
}
select.animate::picker(select) {
transition-property: display, color/*, overlay*/;
transition-behavior: allow-discrete;
transition-duration: 100s;
transition-timing-function: steps(2, start);
color: white;
}
select.animate option {
transition-property: background-color;
transition-duration: 100s;
transition-timing-function: steps(2, start);
background-color: black;
}
::picker(select) {
color: white;
}
option {
background-color: black;
}
select.animate:not(:open)::picker(select) {
color: black;
}
select.animate:not(:open) option {
background-color: white;
}
</style>
<script>
const select = document.querySelector('select');
const option = document.querySelector('option');
promise_test(async () => {
await test_driver.click(select);
await new Promise(requestAnimationFrame);
select.classList.add('animate');
await new Promise(requestAnimationFrame);
await test_driver.click(select);
await new Promise(requestAnimationFrame);
await new Promise(requestAnimationFrame);
const style = getComputedStyle(option);
assert_equals(style.color, 'rgb(128, 128, 128)',
'color should transition based on the exit animation.');
assert_equals(style.backgroundColor, 'rgb(128, 128, 128)',
'background-color should transition based on the exit animation.');
}, 'Top layer exit animations should work on ::picker(select) just like a popover.');
</script>
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