Web Platform
Browser, HTML, CSS, and Web API questions
Hatchling
Intermediate
Explain CORS and How to Debug It
CORS errors are the bane of frontend development. Understanding the mechanism separates debugging from guessing.
Compare Browser Storage Mechanisms
Cookies vs localStorage vs sessionStorage vs IndexedDB â every storage mechanism exists for a specific reason. Picking the wrong one is a security or performance bug.
Browser Observer APIs & Implementation
IntersectionObserver, MutationObserver, ResizeObserver â how they work, how to implement them, and why they replaced scroll handlers and polling.
HTML Accessibility Explained
Accessibility isn't a feature â it's a quality of engineering. Your answer reveals whether you build for all users or just sighted mouse users.
Dinosaur
Advanced
Web Accessibility for Senior Engineers
Accessibility isn't a checkbox. It's an engineering discipline that affects architecture, testing, and component design.
SSR vs CSR vs Static Generation
The rendering strategy question is an architecture question in disguise. Your answer reveals whether you think about trade-offs or just recite definitions.
Web Workers & Service Workers Explained
JavaScript is single-threaded... except when it isn't. This question tests whether you know how to break free from the main thread.
Webpack and Bundlers Explained
Build tools are the plumbing of frontend engineering. Understanding them separates developers who configure from those who copy-paste configs.