Front End Development Cheat Sheet 2026

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

1. In HTML, which input type renders a date picker in modern browsers? → type='date'
2. In Vue.js, which directive conditionally renders an element by toggling its display property? → v-show
3. What does the HTML attribute 'loading="lazy"' on an tag enable? → Defers loading the image until it's near the viewport
4. What problem do CSS Modules solve in large front-end projects? → They locally scope CSS class names to a component to prevent global namespace collisions
5. In React, what is the purpose of the useState hook? → To add local state to a functional component
6. What is the primary value of case study analysis in Front End Development training? → Developing critical thinking by applying theory to realistic professional scenarios
7. In CSS, which property controls the space between an element's border and its content? → padding
8. How are CSS custom properties (CSS variables) defined? → Using the --variable-name syntax within a selector scope
9. What is a risk mitigation strategy in Front End Development practice? → Implementing controls that reduce the likelihood or impact of identified risks
10. What does 'First Contentful Paint' (FCP) measure in web performance? → Time until the first text or image is painted on screen
11. Which CSS at-rule applies styles conditionally based on screen width or device characteristics? → @media
12. In BEM naming convention, how is a child element within a block written? → block__element
13. How should an Front End Development professional handle a situation outside their scope of competency? → Recognize limitations and refer to or consult with appropriate specialists
14. What is the benefit of using a Content Delivery Network (CDN) for a US-based website? → It serves assets from geographically closer servers to reduce latency
15. In Vue 3, what replaces the Options API for organizing component logic? → Composition API
16. Which HTTP caching header tells the browser how long to cache a resource? → Cache-Control
17. What is the purpose of React's useCallback hook? → Memoizes a callback function to prevent unnecessary re-creation on re-renders
18. How do continuing education requirements benefit Front End Development certified professionals? → They ensure professionals stay current with evolving industry practices and knowledge
19. Which approach best demonstrates professional competency in Front End Development practice? → Integrating continuing education, practical experience, and evidence-based decision making
20. Which tool would a front-end developer use to measure Core Web Vitals on a production site? → Google PageSpeed Insights
21. Which performance metric measures unexpected layout shifts experienced by users? → Cumulative Layout Shift
22. How may a numbered list be created? → ol
23. What is tree shaking in the context of JavaScript bundlers? → Removing unused code from the final bundle
24. What is the purpose of the JavaScript 'addEventListener' method? → Attaches an event handler function to an element
25. Which browser developer tool metric measures the time until the largest visible content element is rendered? → Largest Contentful Paint
26. How do Front End Development professionals build trust with clients or stakeholders? → Through consistent competence, transparency, reliability, and ethical behavior
27. How should Front End Development professionals apply research findings to practice? → Critically evaluate applicability, adapt to context, and monitor outcomes
28. How do Front End Development professionals evaluate research quality? → By assessing methodology, sample size, peer review status, and relevance to practice
29. What does the 'defer' attribute on a tag do differently from 'async'? → Executes the script after HTML parsing is complete, in order
30. JavaScript is identical to Java. → No