It can be enabled by setting `$wgTabberNeueEnableLegacyMode` to `true`.
It is the first implementation and a WIP with numerous caveats:
- Nested Tabber does not work
- Tabber Transclue does not work
* Add skeleton screen to avoid layout shift
* Hide other sections before the module is loaded to avoid layout shift
* Add noscript message
* Header container is now saved in parser instead of being generated.
If you have any issues with the script, try clearing out the parser cache
or do an empty edit.
Pages with tabber/tabbertransclude tag will have a tracking category called Category:Pages using Tabber/TabberTransclude parser tag. To hide the category, put the __HIDDENCAT__ magic word on the category page
