dialog-overlay.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/interactive-elements/the-dialog-element/dialog-overlay.html - WPT Dashboard Interop Dashboard

<!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");

    assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "none",

                  "Computed overlay for ::backdrop");

  }, "dialog computed overlay initially 'none'");

  test(() => {

    dialog.showModal();

    assert_equals(getComputedStyle(dialog).overlay, "auto",

                  "Computed overlay on open dialog");

    // ::backdrop pseudo element is always rendered in the top layer when its

    // originating element is. It does not get its overlay property changed,

    // though.

    assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "none",

                  "Computed overlay for ::backdrop");

    dialog.close();

    assert_equals(getComputedStyle(dialog).overlay, "none",

                  "Computed overlay on closed dialog");

    assert_equals(getComputedStyle(dialog, "::backdrop").overlay, "none",

                  "Computed overlay for ::backdrop");

  }, "Opening and closing a modal dialog changes computed overlay to 'auto' and back to 'none'");

</script>