This tests that aria-modal on dialog makes other elements inert.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
Dialog is displaying
PASS backgroundAccessible() is false
Dialog is not displaying
PASS backgroundAccessible() is true
PASS okButton.isIgnored is false
Dialog is not displaying and aria-modal=true
Dialog is displaying and aria-hidden=true
Dialog is displaying and aria-hidden=false
Dialog is not displaying with opacity 0
Dialog is displaying with opacity 1
Dialog is not displaying with parent opacity 0
Dialog is displaying with parent opacity .5
Dialog is removed from DOM
PASS successfullyParsed is true
TEST COMPLETE
Other page content with a dummy focusable element
Display a dialog