BackstopJS Visual Regression Testing Automation

BackstopJS gives agents a repeatable way to capture reference screenshots, compare UI states, and flag visual regressions before changes ship. This skill centers on the real BackstopJS project and turns browser-based layout comparison into a structured QA workflow for web teams.

Installation

Use the upstream install or setup path that matches your environment:

• npm install -g backstopjs
• First, go ahead and install docker on your machine from the Docker Downloads Page.
• Make sure Docker is running on your machine. On MacOS there is a menu item that looks like this... ![MacOS Docker Menu Item](https://user-images.githubusercontent.com/447033/42773728-fef034f4-88e2-11e8-9956-d58a7d4324...
• npm install backstopjs

Requirements and caveats from upstream:

• Backstop 6.3.2 -- now with support for Node 20 Many thanks to @dgrebb for this doozy of a maintainance release!
• Integrated Docker rendering -- to eliminate cross-platform rendering shenanigans
• Run globally or locally as a standalone package app or require('backstopjs') right into your node app

Basic usage or getting-started notes: