I want to debug (examine DOM, use the interactive JS console, etc) part of a web application that is inside a modal dialog that was created by showModalDialog()
.
F12 works to bring up the developer tools if you turn the address bar on.
Go Tools / Internet options / Security / (pick the right zone for your site) / Custom Level Under "Miscellaneous" Under "Allow websites to open windows without address or status bars", choose "Disable".
Source: https://stackoverflow.com/a/10984858/79835