Visual Regression Testing Questions

Visual regression testing focuses on detecting unintended visual or layout changes to a user interface by comparing current renderings against approved baselines. Candidates should be able to explain capturing component and full page screenshots, choosing comparison algorithms and tolerance thresholds, masking or stabilizing dynamic regions, handling animations and font rendering differences, validating across viewports and browsers, managing golden images and baseline updates, integrating visual checks into continuous integration and continuous delivery pipelines, triaging visual diffs, and reducing flakiness through deterministic rendering and smart selectors. Familiarity with common tooling and trade offs between pixel precise and layout tolerant approaches is useful.