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#### 3.1.4 Summary Highlighting

`gnus-visual-mark-article-hook`

  This hook is run after selecting an article. It is meant to be used for highlighting the article in some way. It is not run if `gnus-visual` is `nil`.

`gnus-summary-update-hook`

  This hook is called when a summary line is changed. It is not run if `gnus-visual` is `nil`.

`gnus-summary-selected-face`

  This is the face (or font as some people call it) used to highlight the current article in the summary buffer.

`gnus-summary-highlight`

  Summary lines are highlighted according to this variable, which is a list where the elements are of the format `(form . face)`. If you would, for instance, like ticked articles to be italic and high-scored articles to be bold, you could set this variable to something like

      (((eq mark gnus-ticked-mark) . italic)
       ((> score default) . bold))

  As you may have guessed, if form returns a non-`nil` value, face will be applied to the line.