HTML Interview Questions & Answers

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HTML Interview Questions & Answers

When it comes to building websites and web applications, HTML (Hypertext Markup Language) is the fundamental language that forms the backbone of the internet. For aspiring web developers, mastering HTML is crucial to success in the field. Whether you’re a fresh graduate looking for your first job or an experienced developer aiming for career growth, it’s essential to prepare yourself for the rigorous interview process that lies ahead. This article aims to equip you with the knowledge and insights necessary to confidently navigate HTML-related interview questions and demonstrate your expertise.

So, whether you’re a beginner looking to build a strong foundation or an experienced developer seeking a refresher, learn html interview questions with answers from the following sections to enhance your HTML knowledge and ensure interview success. Let’s get started!

Basic-level HTML interview questions

Here are ten basic-level HTML interview questions and their corresponding answers:

  • What is HTML?

HTML (Hypertext Markup Language) is the standard markup language used to create the structure and content of webpages. It consists of tags and elements that define the various components of a webpage.

  • What is the basic structure of an HTML document?

An HTML document starts with the <!DOCTYPE html> declaration, followed by the <html> element. Inside the <html> element there are two main sections: the <head> section for metadata and the <body> section for the visible content.

  • What are HTML tags, and how are they used?

HTML tags are elements used to mark up and define different parts of a webpage. They are enclosed in angle brackets (< >). For example, <h1> is a heading tag, <p> is a paragraph tag, and <img> is an image tag.

  • What is the difference between block-level and inline elements?

Block-level elements start on a new line and occupy the full width available, such as <div> and <p>. Inline elements, on the other hand, do not start on a new line and only take up the necessary width to display the content, such as <span> and <a>.

  • How do you create a hyperlink in HTML?

Hyperlinks are created using the <a> (anchor) tag. The href attribute specifies the URL or destination of the link. For example: <a href=”https://www.example.com”>Click here</a>. 

  • What is the purpose of the alt attribute in the <img> tag?

The alt attribute in the <img> tag provides alternative text for an image. It is displayed if the image fails to load or for visually impaired users who rely on screen readers.

  • How do you add comments in HTML?

Comments in HTML are added using the <!– –> syntax. Anything written within these tags is not displayed on the webpage but can provide explanatory notes or reminders for developers.

  • What is the difference between <div> and <span>?

<div> is a block-level element used for grouping and creating sections of a webpage while <span> is an inline element used for applying styles or targeting specific parts of text within a larger block of content.

  • How do you add a line break in HTML?

Line breaks can be inserted using the <br> tag. It is a self-closing tag meaning it does not require a closing tag.

  • How can you add styles to HTML elements?

HTML itself is primarily responsible for defining the structure and content of a webpage. To add styles you would use CSS. CSS can be applied internally within the HTML document using the <style> tag, externally via a separate CSS file or inline using the style attribute within specific HTML elements.

Intermediate-level HTML interview questions

Here are ten intermediate-level HTML interview questions and their corresponding answers:

  • What is the purpose of the meta tag in HTML?

The meta tag is used to provide metadata about an HTML document. It includes information such as the character encoding, viewport settings, keywords, and description of the page for search engines and browsers.

  • What is the difference between <span> and <div> in terms of their default styling?

<span> is an inline element and does not have any default styling, while <div> is a block-level element that, by default, takes up the full width available and starts on a new line.

  • How can you include an external CSS file in an HTML document?

To include an external CSS file, you can use the <link> tag within the <head> section of the HTML document. The href attribute specifies the path to the CSS file, and the rel attribute defines the relationship between the HTML and CSS files.

  • What is the purpose of the id and class attributes in HTML?

The id attribute is used to uniquely identify an element on a webpage, while the class attribute is used to assign one or more classes to an element. IDs are typically used for specific targeting, while classes are used to group and apply styles to multiple elements.

  • What are semantic HTML tags, and why are they important?

Semantic HTML tags are elements that carry meaning and describe the structure of content. Examples include <header>, <nav>, <section>, and <footer>. Using semantic tags improves accessibility, and SEO, and makes the code more readable and maintainable. 

  • How can you embed a video in an HTML document?

Videos can be embedded using the <video> tag. You can specify the video source using the <source> tag within the <video> element, and include fallback content between the opening and closing <video> tags.

  • How do you create a responsive webpage in HTML?

Responsive web pages can be created using CSS media queries. By defining different styles based on the viewport size or device characteristics, you can adjust the layout, font sizes, and other elements to ensure optimal viewing on various screen sizes.

  • What is the purpose of the aria-* attributes in HTML?

The aria-* attributes are used to enhance the accessibility of HTML elements. They provide additional information to assistive technologies, such as screen readers, to interpret and navigate the content more accurately.

  • How do you set a background image for a webpage using CSS?

To set a background image, you can use the background-image property in CSS. For example: body { background-image: url(‘image.jpg’); }. You can also control the position, repeat behaviour, and other properties of the background image.

  • How can you embed custom fonts in an HTML document?

Custom fonts can be embedded in HTML using the @font-face rule in CSS. This rule allows you to specify the font file’s path and format and define a name for the font. Once defined, you can use that name in the font-family property to apply the custom font to specific elements.

Advanced-level HTML interview questions

Here are ten advanced-level HTML interview questions and their corresponding answers:

  • What is the purpose of the <canvas> element in HTML5?

The <canvas> element provides a drawing surface for graphics and animations through JavaScript. It allows developers to dynamically generate and manipulate graphics, charts, and visualisations on a webpage.

  • How can you implement drag-and-drop functionality in HTML?

Drag-and-drop functionality can be implemented using the HTML5 Drag and Drop API. By utilising event handlers like dragstart, dragover, dragenter, dragleave, and drop, you can enable drag-and-drop interactions between elements on a webpage.

  • What are WebSockets in HTML5, and how do they differ from traditional HTTP requests?

WebSockets provide full-duplex communication channels between a client and a server, allowing real-time data transfer. Unlike traditional HTTP requests that follow a request-response model, WebSockets enable bidirectional communication, making them ideal for applications requiring constant data updates or live interactions.

  • How do you integrate video and audio content with HTML5?

HTML5 provides the <video> and <audio> elements for embedding video and audio content. You can specify the source files using the <source> element within these tags, allowing the browser to automatically select the appropriate format based on browser compatibility.

  • What is the purpose of the <figure> and <figcaption> elements in HTML5?

The <figure> element represents self-contained content, such as images, illustrations, diagrams, or videos. The <figcaption> element is used to provide a caption or description for the content within the <figure> element.

  • How can you implement responsive images in HTML?

Responsive images can be implemented using the <picture> element and the srcset and sizes attributes. By providing multiple image sources with different resolutions or aspect ratios and specifying appropriate media queries, you can ensure that the browser selects and displays the most suitable image based on the device’s capabilities.

  • What is the difference between the <aside> and <section> elements in HTML5?

The <aside> element represents content that is tangentially related to the main content but can be considered separate from it. It often contains sidebars, pull quotes, or advertisements. <section> represents a thematic grouping of content and is used to divide a document into sections or chapters.

  • How can you implement geolocation functionality in HTML5?

HTML5 provides the Geolocation API, which allows web applications to access a user’s geographical location. By using JavaScript and the navigator.geolocation object, you can request and obtain the user’s position information, enabling location-based features.

  • What are the new form input types introduced in HTML5?

HTML5 introduced several new input types, including date, time, email, url, number, range, colour, and more. These input types provide better input validation and user experience for specific data formats.

  • How do you implement local storage in HTML5?

HTML5 introduced the Web Storage API, which includes the localStorage object. It allows web applications to store data locally in the user’s browser. By using JavaScript, you can save and retrieve data in the form of key-value pairs, persisting the data even after the browser is closed.

Conclusion

In conclusion, HTML is a crucial language in web development. It provides the structure and foundation for creating web pages and is essential for anyone entering the field. Throughout this article, we have covered a wide range of interview questions about html, from basic to advanced levels, providing insights into syntax, tags, elements, attributes, forms, responsive design, and more. 

By understanding these concepts, developers can create robust, accessible, and visually appealing websites. 

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If you want to become a software developer, then try our free 5 Day Coding Challenge to learn some basics of HTML, CSS and JavaScript. Register now through the form below.

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