The slot name is EXIT_STITIAL_BOXAD_1, sizes passed are 600x400,300x250.

Another note: the modal will be only shown to anonymous user and only on wikis with $wgEnableOutboundScreenExt variable set (Current list of such sites is kept under this URL:

Click here to trigger exitstitial ad

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.