Tests that Window.showModalDialog is undefined if the client does not allow showing modal dialogs.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Make sure window.showModalDialog is undefined when modal dialogs are not allowed.
internals.setCanShowModalDialogOverride(false)
PASS window.showModalDialog is undefined
PASS window.hasOwnProperty('showModalDialog') is false

Tests having a named property with name 'showModalDialog'.
document.body.append(testFrame)
PASS window.showModalDialog is testFrame.contentWindow
testFrame.remove()
PASS window.showModalDialog is undefined

Tests that window.showModalDialog is no longer undefined when modal dialogs become allowed.
internals.setCanShowModalDialogOverride(true)
PASS window.showModalDialog is not undefined
PASS window.hasOwnProperty('showModalDialog') is true
PASS window.showModalDialog is an instance of Function

Make sure window.showModalDialog can be shadowed.
window.showModalDialog = 1
PASS window.showModalDialog is 1
delete window.showModalDialog
PASS window.showModalDialog is undefined
PASS successfullyParsed is true

TEST COMPLETE