Capturing

Visual Comparisons and Screenshots

How Playwright captures, compares, and maintains screenshot baselines to catch visual regressions that functional assertions miss.

Visual Testing and Screenshots

Learn how Cypress captures screenshots automatically and manually, and how visual regression plugins detect unwanted UI changes.

Backreferences and Groups

Master capturing parts of a match with groups and reusing them via backreferences in both the pattern and the replacement of sed substitutions.

Event Bubbling and Capturing in JavaScript

Understand the two phases of DOM event propagation — capturing (top-down) and bubbling (bottom-up) — and how to control them.

Functional vs Non-Functional Requirements

How to distinguish what a system must do (functional requirements) from how well it must do it (non-functional requirements), and why both shape architecture.