Testability ids! is a free Chrome add-on developed by karlo.smid. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. The add-on adds a unique data-testabilityid attribute to all HTML elements in the DOM tree of a web page.

This tool is designed to assist testers who need to automate the testing of web applications. By recursively walking through the DOM tree, Testability ids! adds the data-testabilityid attribute with a value that represents the unique element path to the root node of the DOM tree. This walk is triggered whenever there is a change in the DOM tree.

To investigate the generated value, users can simply use the shift key and left click on any page element. The value will be printed in the JavaScript console with the testability_ids: log filter.