Answer: Introduced in v5.1.16

• If a tiddler has no tags, but needs styling use: data-tiddler-title as CSS selector
  • There is only one tiddler
• If a user wants to style system tiddlers in a custom way: use: [data-tiddler-title^="$:"/] as a selector
  • using the TW namespace functionality
• If the user wants special behaviour for tagged tiddlers. eg: Learning
  • use: [data-tags*="Learning"] as CSS selector.

The names I'm using are only used for documentation purpose, without changing the existing wiki. I don't want, that the docs has side effects.

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