The single biggest lever on E2E reliability is how you locate elements. Build a locator, watch which elements it matches in the sample app, and learn why role- and label-based locators survive redesigns that break CSS selectors.
Pair this with the Designing Reliable E2E Tests guide and the Playwright entry in the Tool Explorer.
Sample app — matched elements are highlighted
page.getByRole('button', { name: 'Sign in' })Matched 2 elements
Matches: Sign in, Sign in with Google
recommendedMirrors how users and assistive tech find elements — resilient to markup changes.