MDN’s new design is in Beta! A sneak peek:

Type: boolean
This is set to true if the tab is immediately after the currently selected tab. This is automatically set when needed and you shouldn't adjust it manually. This is primarily useful for themes so that they can adjust the appearance of the area around the selected tab.

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 Contributors to this page: Sheppy, Natch, Marsf, Ptak82, Okome, Mgjbot, Dria
 Last updated by: Sheppy,