Web Development Cheat Sheet 2026

The 30 highest-yield Web Development facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the primary purpose of a 'skip navigation' link at the top of a web page? → To allow keyboard users to bypass repetitive navigation and jump to main content
2. Which approach is recommended for troubleshooting responsive design issues? → Use systematic isolation and testing methods
3. Which HTTP/2 feature eliminates the need for domain sharding as a performance technique? → Multiplexing
4. Which method is used to attach an event handler to a DOM element in modern JavaScript? → element.addEventListener()
5. What is a Higher-Order Component (HOC) in React? → A function that takes a component and returns a new component with added behavior
6. Which type of database relationship requires an intermediary (junction) table? → Many-to-many
7. Which of the following procedures must empty the list of subpaths in order for the context to have zero subpaths once more? → beginPath()
8. In HTML 5, which of the following is not a new element? → frameset
9. What is a JavaScript generator function? → A function declared with `function*` that can pause and resume execution using `yield`
10. Which of the following elements is used to highlight content in the same way that a highlighter pen is used to highlight text in a book? → mark
11. What is the recommended response when a security incident is detected in an Web Development environment? → Follow the incident response plan: contain, eradicate, recover
12. What does `git blame ` show? → Each line of a file annotated with the commit and author that last modified it
13. What is the primary benefit of version control in apis and rest for Web Development? → It tracks changes and enables collaboration
14. What is the difference between localStorage and sessionStorage in browsers? → localStorage persists until cleared; sessionStorage clears when the tab closes
15. Which of the following is a characteristic of a RESTful API's uniform interface? → Resources are identified by URIs and manipulated through standard HTTP methods
16. Which HTML element is used to embed an inline scalable vector graphic without an external file? →
17. Which Vue.js Composition API function is equivalent to the Options API's `computed` property? → computed()
18. What does the 'Retry-After' HTTP header communicate to API clients? → How long the client should wait before making another request
19. What does Rails' 'Convention over Configuration' principle mean? → Developers follow framework defaults to avoid boilerplate configuration
20. Which of the following browser-based tools is most commonly used to run an automated accessibility audit on a web page? → Lighthouse (in Chrome DevTools)
21. In Web Development certification, what is the purpose of automated testing? → To catch regressions and verify functionality continuously
22. What does 'tree shaking' accomplish in modern JavaScript build tools? → Removes unused exports from the final bundle
23. What is the main advantage of using a Service Worker for caching over standard HTTP caching? → Service workers give you programmatic control over cache strategies and offline support
24. In GitHub's pull request workflow, what does 'squash and merge' do? → Combines all PR commits into a single commit before merging into the base branch
25. What is the function of an Nginx reverse proxy in a web deployment? → Forwarding client requests to backend application servers and returning responses
26. What is 'test flakiness' in the context of automated testing? → Tests that produce inconsistent pass/fail results without code changes
27. Which approach best demonstrates mastery of version control in Web Development practice? → Applying principles to novel situations with sound judgment
28. In HTML 5, which of the following elements has been removed? → dir
29. Which Angular feature allows you to lazy-load feature modules? → RouterModule with loadChildren
30. What is 'lazy loading' in the context of images? → Loading images only when they enter (or approach) the viewport