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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://drafts.csswg.org/selectors-4/#open-state">
<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>
<style>
dialog:open + #afterdialog,
details:open + #afterdetails,
select:open + #afterselect {
will-change: text-decoration;
}
</style>
<dialog>dialog</dialog>
<p id="afterdialog"></p>
<details>details</details>
<p id="afterdetails"></p>
<select>
<option>one</option>
</select>
<p id="afterselect"></p>
<script>
test(() => {
const dialog = document.querySelector('dialog');
const after = document.getElementById("afterdialog");
assert_false(dialog.matches(':open'),
':open should not match when the dialog is closed.');
assert_equals(getComputedStyle(after).willChange, "auto",
":open style should not be applied when the dialog is closed");
dialog.show();
assert_true(dialog.matches(':open'),
':open should match after dialog.show().');
assert_equals(getComputedStyle(after).willChange, "text-decoration",
":open style should be applied after dialog.show()");
dialog.close();
assert_equals(getComputedStyle(after).willChange, "auto",
":open style should not be applied when the dialog is closed (2)");
dialog.showModal();
assert_true(dialog.matches(':open'),
':open should match after dialog.showModal().');
assert_equals(getComputedStyle(after).willChange, "text-decoration",
":open style should be applied after dialog.showModal()");
dialog.close();
assert_equals(getComputedStyle(after).willChange, "auto",
":open style should not be applied when the dialog is closed (3)");
}, 'The dialog element should support :open.');
test(() => {
const details = document.querySelector('details');
const after = document.getElementById("afterdetails");
assert_false(details.matches(':open'),
':open should not match when the details is closed.');
assert_equals(getComputedStyle(after).willChange, "auto",
":open style should not be applied when the details is closed");
details.open = true;
assert_true(details.matches(':open'),
':open should match when the details is open.');
assert_equals(getComputedStyle(after).willChange, "text-decoration",
":open style should be applied when the details is open");
}, 'The details element should support :open.');
promise_test(async () => {
const select = document.querySelector('select');
const after = document.getElementById("afterselect");
assert_false(select.matches(':open'),
':open should not match when the select is closed.');
assert_equals(getComputedStyle(after).willChange, "auto",
":open style should not be applied when the select is closed");
await test_driver.click(select);
await new Promise(requestAnimationFrame);
assert_true(select.matches(':open'),
':open should match when the select is open.');
assert_equals(getComputedStyle(after).willChange, "text-decoration",
":open style should be applied when the select is open");
}, 'The select element should support :open.');
</script>
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