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Wikipedia: sticky table of contents

Keeps the Wikipedia table of contents visible and scrollable while you read the article.

Code to copy

#vector-toc,
.vector-toc,
#toc {
  position: sticky !important;
  top: 8px;
  max-height: 90vh;
  overflow: auto;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.