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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-overlay.html 

<!doctype html>
<title>popover: overlay</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/popover.html#the-popover-attribute">
<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 popover id="popover-show-dialog"></dialog>
<dialog popover id="popover-show-modal-dialog"></dialog>
<dialog popover id="popover-dialog"></dialog>
<div popover id="popover-div"></div>
<script>
  test(() => {
    const popover_show_dialog = document.getElementById("popover-show-dialog");
    assert_equals(getComputedStyle(popover_show_dialog).overlay, "none",
                  "Computed overlay");
    popover_show_dialog.show();
    assert_equals(getComputedStyle(popover_show_dialog).overlay, "none",
                  "Computed overlay after show()");
    popover_show_dialog.close();
  }, "dialog.show() should not put popover dialog in top layer");

  test(() => {
    const popover_show_modal_dialog = document.getElementById("popover-show-modal-dialog");
    assert_equals(getComputedStyle(popover_show_modal_dialog).overlay, "none",
                  "Computed overlay");
    popover_show_modal_dialog.showModal();
    assert_equals(getComputedStyle(popover_show_modal_dialog).overlay, "auto",
                  "Computed overlay after showModal()");
    popover_show_modal_dialog.close();
  }, "dialog.showModal() should put popover dialog in top layer");

  test(() => {
    const popover_dialog = document.getElementById("popover-dialog");
    assert_equals(getComputedStyle(popover_dialog).overlay, "none",
                  "Computed overlay");
    popover_dialog.showPopover();
    assert_equals(getComputedStyle(popover_dialog).overlay, "auto",
                  "Computed overlay after showPopover()");
    popover_dialog.hidePopover();
  }, "dialog.showPopover() should put popover dialog in top layer");

  test(() => {
    const popover_div = document.getElementById("popover-div");
    assert_equals(getComputedStyle(popover_div).overlay, "none",
                  "Computed overlay");
    popover_div.showPopover();
    assert_equals(getComputedStyle(popover_div).overlay, "auto",
                  "Computed overlay after showPopover()");
    popover_div.hidePopover();
  }, "div.showPopover() should put popover div in top layer");
</script>