When documenting test automation design patterns in web development, there are various tools and formats available. Markdown is a lightweight markup language that allows you to create formatted documents using plain text. This can be used to write README files, wiki pages, or blog posts that explain the design patterns. Extensions can also be added to include code blocks, tables, images, or links. JSDoc is a documentation generator for JavaScript that creates HTML pages from comments in the source code. It is useful for documenting functions, parameters, returns, and exceptions of the test scripts. JSDoc tags can be used to specify the design patterns used and link them to external references. Lastly, Sphinx is a documentation generator for Python that creates HTML, PDF, or ePub documents from reStructuredText files. It is useful for documenting modules, classes, methods, and attributes of the test scripts as well as adding code blocks, diagrams, cross-references, or indexes to your documents.