HTML5 Interview Questions and Answers

Last updated on Feb 08, 2024
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HTML5 Interview Questions

In the past years, the adoption of HTML5 has increased in an emerging way that more and more companies are using it to deliver rich cross-platform web applications. In this article, we have tried to cover all HTML5 Interview Questions and Answers which are for both basic and advanced levels. Now the question that would come to your mind is- what is HTML5? To develop any web application mainly three components are required i.e. HTML, CSS, and Javascript where HTML is mainly used for designing the website.HTML5 is the latest version which supports all kinds of existing web pages. Every web page you visit today on the internet is written with one or another version of HTML code. HTML5 is one of the highest-paying web technologies so everyone needs to learn basic concepts about this markup language. Companies like Facebook, Amazon, Google, and Youtube have been shifted to HTML5 from Adobe’s Flash for better development. For many years, millions of developers were using this technology but since 2015 it is the most reliable and universal choice to develop web applications. To help you with the same, we have created this article which would clear all your concepts regarding HTML5.

Quick Facts About HTML5
What is HTML5? It is a MARKUP language that is mainly used for creating interfaces rather than analytical works or logical.
What is the latest version of HTML5? HTML5.2 released on December 2017
Who developed HTML5? WHATWG
When was HTML5 first released? 28 October 2014

Most Frequently Asked HTML5 Interview Questions

Here in this article, we will be listing frequently asked HTML5 Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q11. What is local storage in HTML5? How it is used?

HTML5 has introduced the concept of Local Storage, which is used to access a web page's local storage area without any time limit. Local storage is available whenever the user wants to use the web page.

The data stored in Local Storage does not get automatically deleted when the browser window is closed; it only gets removed when deleted manually. In local storage, the data is stored using a key and value.

Q12. What are the different types of storage in html5? Explain

In HTML5, data can be stored in 2 ways – session storage and local storage.

  • Session Storage: The data or details from the current browsing session are stored. Once the browser gets closer by the user, the storage data gets removed.
  • Local Storage: The data does not get cleared automatically when the user closes the browser.
Q13. What is the use of <audio> and <video> tags in Html5?

The <audio> tag in HTML5 is used to embed voice in an HTML document. Designers use <source> tag to specify media type along with other attributes.

The <video> tag in HTML5 is used to embed a video file in an HTML document. Designers can use <source> tag to specify media type along with other attributes.

Q14. What is the use of <fieldset>?

The <fieldset> tag in HTML5 is used to group together related form elements. A <fieldset> must begin with a <legend> tag because this tag will define the title of the fieldset. By using <fieldset> tag and <legend> tag together, designers can make their forms easier to understand and use.

The syntax for <fieldset> tag is: <fieldset>Controls</fieldset>

Q15. What is image map in Html5?

In HTML 5, an Image map is one having clickable areas. The tag map defines an image-map.


<img src="" alt="Workplace" usemap="#workmap">
<map name="workmap">
    <area shape="rect" coords="34,44,270,350" alt="Computer" href="computer.htm">
    <area shape="rect" coords="290,172,333,250" alt="Phone" href="phone.htm">
    <area shape="circle" coords="337,300,44" alt="Coffee" href="coffee.htm">

Q16. What is the application cache in HTML5 and why it is used?
The application cache is a feature in HTML 5 which is used to store website data inside a cached version, thus allowing accessibility without net connectivity. It is very useful for desktop-based web applications requiring to store data on local systems.
Q17. What is MathML in Html5?

MathML is Mathematical Markup Language. This language is used to show scientific and mathematical content on web pages. HTML5 allows you to use MathML elements in a document using <math>...</math> tags.

A mathematical expression should be inserted in the element <math> with a specified namespace as shown below: <math xmlns=""> </math>

Q18. Is it possible for a webpage to contain multiple <header> or <footer> elements?

Yes, both <header> and <footer> can be added multiple times in a webpage. Both of these tags are designed to serve a crucial purpose in relation to their parent section. Not only the page <body> contains a header and a footer, but every <section> and <article> also contains these two, although the use of multiple footers is always not required.

Q19. What is a Web Worker in Html5?

A web worker in HTML5 is a script that runs on a separate thread in the background without the need for the main web page to wait for it to complete. Web Workers enable long tasks to be achieved without keeping the web page responsive.

There are two types of web workers - Dedicated workers and Shared workers.

Q20. What are the web storages present in HTML5?
In HTML5, users will receive two types of web storages as following.

1. Local Storage: Here, data will be stored in the local storage, and will not be cleared automatically or when we close the browser.

2. Session Storage: With this type, the user’s browser current session data will be stored. Once the browser is closed, the storage will be cleared.

Today HTML is considered as the base for all web applications, but with each passing version, many new elements and features have been added to it. So, there is a high chance that the interviewer may ask about the currently used features but as it all starts with HTML so one must learn both. To summarize-

  • Should know the difference between versions of HTML especially HTML4 and HTML5
  • When writing code, always close your HTML tags.
  • Remember HTML is a Markup language, not a programming language.
  • Work with the lists and be more familiar with HTML tables.

Features of HTML5

  • Editing content within element and "required" form attribute
  • Figure tag and SVG element
  • Web fonts
  • Transition and Animation
  • Web Icons
  • Easily implemented audio, video, map with these tags
Reviewed and verified by Umesh Singh
Umesh Singh

My name is Umesh Singh having 11+ experience in Node.JS, React JS, Angular JS, Next JS, PHP, Laravel, WordPress, MySQL, Oracle, JavaScript, HTML and CSS etc. I have worked on around 30+ projects. I lo...