Browser Testing with DevTools

Runtime verification using browser DevTools capabilities: DOM state, console errors, network failures, performance signals, and accessibility tree. Complements gstack/browser-qa with DevTools-first debugging and explicit untrusted-content boundaries.

When to use

• Verify fix in running app
• Investigate client-side errors or failed requests
• Check responsive layout or a11y tree in real browser
• Validate performance or Core Web Vitals on a URL

When not to use

• Unit/integration tests suffice
• No browser runtime involved
• Untrusted page content without sandbox (see boundary below)

Trust boundary