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<!doctype html>
<title>dialog: overlay</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<dialog id="dialog"></dialog>
<script>
const dialog = document.getElementById("dialog");
test(() => {
assert_equals(getComputedStyle(dialog).overlay, "none",
"Computed overlay");
// dialog::backdrop {} UA rule always sets overlay to 'auto' even if
// ::backdrop pseudo is not generated. ::backdrop is only generated when the
// dialog is in the top layer.
assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "auto",
"Computed overlay for ::backdrop");
}, "dialog computed overlay initially 'none'");
test(() => {
dialog.showModal();
assert_equals(getComputedStyle(dialog).overlay, "auto",
"Computed overlay on open dialog");
assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "auto",
"Computed overlay for ::backdrop");
dialog.close();
assert_equals(getComputedStyle(dialog).overlay, "none",
"Computed overlay on closed dialog");
// ::backdrop is always overlay:auto. See comment above.
assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "auto",
"Computed overlay for ::backdrop");
}, "Opening and closing a modal dialog changes computed overlay to 'auto' and back to 'none'");
</script>
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