These bookmarklets/favelets are designed for evaluating web accessibility, but are not necessarily tools for web developers. The primary purpose of these bookmarklets is to facilitate data collection of a site's accessibility alongside supporting some basic human verification. The generated TSV data can then be uploaded into a database for larger scale analyses.
Details about the bookmarklets and how to use them can be found on the A11Y Bookmarklet resource page.
The bookmarklets utilize the following external JavaScript libraries. Copies of these are kept in the externals/ directory to allow for local usage and to create a single point for downloads.
The bookmarklets are released under the Mozilla Public License Version 2.0. Contribute and expand while respecting creators.