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What are basic HTML interview questions?

HTML interview questions are crucial for frontend developer roles, focusing on topics like semantic elements, accessibility, and modern features such as the `<dialog>` element and lazy loading. Candidates should be prepared to discuss HTML's Living Standard, performance, and security practices, as well as demonstrate knowledge of forms and validation without JavaScript. Understanding the structure of interviews, including skills demonstrations and open-ended questions, is essential. Mastery of HTML fundamentals and modern practices is vital for success in coding interviews, as it lays the groundwork for further web development concepts.

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HTML interview questions remain a core part of frontend developer interviews, covering everything from semantic elements and accessibility to modern features like dialog, popover, and inert. Expect questions spanning basic markup, forms, validation, responsive media, storage APIs, and security best practices, all reflecting the HTML Living Standard maintained by the WHATWG.

Key takeaways

  • Semantic HTML matters: Interviewers expect you to explain why you choose elements like <article>, <section>, and <main> for accessibility, SEO, and maintainability.

  • Modern features are fair game: Be ready to discuss native APIs such as <dialog>, the popover attribute, the inert attribute, and fetchpriority for resource loading.

  • Performance and security come up often: Questions cover lazy loading with loading="lazy", responsive images via srcset, and safe iframe embedding using sandbox and referrerpolicy.

  • Forms and validation without JavaScript: Know how to use native input types, required, pattern, autocomplete tokens, and proper <label> associations to build accessible, functional forms.

  • HTML is a Living Standard now: The WHATWG maintains HTML as a continuously updated specification, so discrete version numbers like "HTML5" are no longer technically accurate.

Frontend development continues to rise in popularity as more companies become web-oriented. As new technologies continue to innovate the frontend space, companies are on the lookout for specialized frontend developers.

When you’re preparing for your frontend development interview, you’ll be brushing up on JavaScript and the latest frameworks, but it’s important that you don’t forget about HTML, one of the foundational building blocks to web development.

You may think that you don’t need to review your HTML concepts, but during the interview, you face nuanced questions that you need to prepare for beforehand. Today, we’ll break down 30+ popular HTML interview questions to refresh your understanding of HTML before your next frontend interview.

Introduction to frontend interviews

Technical front-end interviews can be incredibly difficult. In almost every scenario, HTML will not be the only concept that you are being interviewed on. You will be tested on your understanding of all components of web development, but HTML is essential to your success. HTML is the first step when it comes to preparing for coding interviews, as it is the foundation of web dev as a whole.

Though we will be focusing on HTML today, ...