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 a Voluntary Product Accessibility Template (VPAT) document? → How a product conforms to accessibility standards such as Section 508 and WCAG
4. You discover that 40% of your users are on slow 3G connections and your bundle is 4 MB. What risk does this pose? → Performance risk leading to high bounce rates and revenue loss
5. What does the HTML attribute 'loading="lazy"' on an tag enable? → Defers loading the image until it's near the viewport
6. Under GDPR, within how many hours must a personal data breach be reported to the supervisory authority? → 72 hours
7. 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
8. Which meta tag prevents browsers from performing MIME type sniffing, reducing certain injection risks? → X-Content-Type-Options: nosniff (response header)
9. In React, what is the purpose of the useState hook? → To add local state to a functional component
10. What is the primary value of case study analysis in Front End Development training? → Developing critical thinking by applying theory to realistic professional scenarios
11. What is the purpose of the CSS `will-change` property? → Hints to the browser which properties will animate for optimization
12. In CSS, which property controls the space between an element's border and its content? → padding
13. How are CSS custom properties (CSS variables) defined? → Using the --variable-name syntax within a selector scope
14. What is a risk mitigation strategy in Front End Development practice? → Implementing controls that reduce the likelihood or impact of identified risks
15. Which HTTP status code indicates a resource has been permanently moved? → 301
16. What is the purpose of a robots.txt file in the context of regulatory compliance? → It can direct crawlers away from pages containing sensitive or regulated data
17. Your team is about to migrate from a legacy CSS framework to a new one across 200 components. The HIGHEST risk you should plan for is: → Visual regressions across components that break the UI for end users
18. What does 'First Contentful Paint' (FCP) measure in web performance? → Time until the first text or image is painted on screen
19. What does the CSS `box-sizing: border-box` rule do? → Includes padding and border in the element's total width and height
20. Which CSS at-rule applies styles conditionally based on screen width or device characteristics? → @media
21. In BEM naming convention, how is a child element within a block written? → block__element
22. Which CSS property creates a new stacking context for an element? → position: relative with z-index
23. 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
24. 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
25. NIST SP 800-53 security controls are typically referenced when building front-end applications for which type of client? → US federal government agencies
26. In CSS Flexbox, what does `justify-content: space-between` do? → Places equal space between items, with no space at the edges
27. In Vue 3, what replaces the Options API for organizing component logic? → Composition API
28. What is required before embedding a third-party analytics script on a site under GDPR? → Valid user consent or a lawful basis that covers the script's data processing
29. Which HTTP caching header tells the browser how long to cache a resource? → Cache-Control
30. What is the purpose of React's useCallback hook? → Memoizes a callback function to prevent unnecessary re-creation on re-renders