I went straight to infinite scroll because it felt modern and I thought that's what they wanted to hear.
Start by clarifying the requirements and constraints (e.g., data size, user goals, performance targets). Then compare pagination and infinite scrolling across dimensions like performance, UX, and implementation complexity, and recommend a solution based on the context. Finally, discuss how you would scale the flexbox layout itself (e.g., virtualization, CSS grid) to handle 100 boxes efficiently.
Pro tip: Mention that the choice depends on the use case: pagination is better for goal-oriented tasks (e.g., finding a specific item), while infinite scrolling suits exploratory browsing (e.g., social media). Also, highlight that virtualization is key for performance with large lists, regardless of the loading strategy.
Ask questions to understand the data size, user goals, and performance constraints. For example, are users searching for a specific item or browsing? What devices and network conditions are targeted?
Discuss pros and cons of each approach in terms of performance, UX, and implementation. For instance, pagination offers better control and is SEO-friendly, while infinite scrolling provides seamless browsing but can cause memory issues.
Choose the appropriate strategy based on the clarified requirements. For Amazon, a product listing might benefit from pagination for findability, while a recommendations feed might use infinite scrolling.
Explain how to scale the flexbox layout to 100 boxes efficiently. Mention techniques like CSS Grid for layout, virtualization (e.g., react-window) to render only visible items, and lazy loading images.
Conclude by summarizing the trade-offs and emphasizing performance optimizations like virtualization, debouncing, and accessibility considerations.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.
Structure your answer around the four areas the interviewer specified: keyboard navigation, ARIA roles, focus management, and live region announcements. For each, explain the specific implementation details and how they work together to create an accessible pagination component. Emphasize that accessibility is not an afterthought but a core requirement, and tie your choices back to real user impact and Amazon's customer obsession.
Pro tip: Mention that you would test with actual screen readers (NVDA, VoiceOver) and keyboard-only navigation, and that you'd use automated tools like axe-core in CI to catch regressions. This shows you understand that accessibility requires both automated and manual verification.
Ask about the expected number of pages, whether the pagination is for a table, list, or search results, and if there are any existing design system components. This ensures your solution fits the context and demonstrates thoroughness.
Ensure all interactive elements (page numbers, previous/next buttons) are focusable and operable via keyboard. Use native <button> or <a> elements, manage tab order logically, and support Enter/Space activation. Consider arrow key navigation within the pagination group for efficiency.
Use <nav aria-label="Pagination"> to wrap the component. Mark the current page with aria-current="page". Use aria-disabled for disabled buttons instead of the disabled attribute to keep them focusable and announce state. Ensure each page link has an accessible name like "Go to page 2".
When a new page loads, move focus to a sensible location: either the first item of the new content, a heading, or the pagination container itself. Avoid losing focus to the body. Use JavaScript to set focus programmatically and ensure it doesn't cause a jarring experience.
Use an aria-live region (polite) to announce the new page number and total results, e.g., "Page 2 of 10, showing items 11 to 20." Ensure the live region is present in the DOM before the update and that the announcement is concise. Avoid announcing on initial load.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.