<!DOCTYPE html>
<html>
<title>Test that modal dialogs have visibility: visible set from the UA sheet</title>
<meta charset="utf-8">
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#flow-content-3:is-modal">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div style="visibility: hidden">
    <dialog>This is a dialog</dialog>
</div>

<script>
let dialog = document.querySelector("dialog");

test(t => {
    dialog.show();
    t.add_cleanup(() => dialog.close());
    assert_equals(getComputedStyle(dialog).visibility, "hidden");
}, "Non-modal dialog should let parent visibility inherit");

test(t => {
    dialog.showModal();
    t.add_cleanup(() => dialog.close());
    assert_equals(getComputedStyle(dialog).visibility, "visible");
}, "Modal dialog should have visibility: visible by default in UA sheet");

test(t => {
    dialog.style.visibility = "hidden";
    dialog.showModal();
    t.add_cleanup(() => {
        dialog.style.removeProperty("visibility");
        dialog.close();
    });
    assert_equals(getComputedStyle(dialog).visibility, "hidden");
}, "Modal dialog visibility should be overridable");
</script>
</html>
