A userscript that collapses markdown headers

• This script makes all markdown headers clickable and toggles the view of all content between same level headers (e.g. between H2 headers).
• It works on readme, issues, markdown preview, wiki & gist pages. Pretty much everywhere on GitHub.
• Click on any header to toggle the view of the content below it.
• Use Shift + Click to toggle the view of all same level header content.
• When the content of a header is expanded, all sub-headers are also expanded.
• Links within the header are still clickable.
• Can be used along with the GitHub-table-of-contents & the GitHub-collapse-in-comment userscripts.

• Use the userscript addon to change these settings (see screenshot below):

  • "Set collapse markdown state" to collapsed (expanded by default) which collapses all header content initially.
  • "Set collapse markdown colors" to an JSON array with six color values (accepts named, hex, rgb, hsl, etc). For example:

   // palette generated by http://tools.medialab.sciences-po.fr/iwanthue/
  // (colorblind friendly; soft)
  ["#6778d0", "#ac9c3d", "#b94a73", "#56ae6c", "#9750a1", "#ba543d"]
  

  These six colors apply to the H1 through H6 header arrows respectively.

  • After changing either option, make sure to reload the page (Shift + F5) to have the updated setting take effect.

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