Bookmarklet

A Firefox browser with a dialog reading "There are about 2502 words on this page."
Demonstration of a bookmarklet that counts the number of words on the page. The browser shown is Firefox 65.0.2 running on Windows 10.

A bookmarklet is a bookmark stored in a web browser that contains JavaScript commands that add new features to the browser. They are stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Bookmarklets are usually small snippets of JavaScript executed when user clicks on them. When clicked, bookmarklets can perform a wide variety of operations, such as running a search query from selected text or extracting data from a table.

Another name for bookmarklet is favelet or favlet, derived from favorites (synonym of bookmark).[1]

  1. ^ Jonathan Avila (2014-03-02). "How to create a favlet for accessibility testing". Archived from the original on 2018-01-22. Retrieved 2023-05-23.{{cite web}}: CS1 maint: bot: original URL status unknown (link)

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