Top 10 HTML5 Interview Questions

By | April 23, 2013
It’s a collection of selected top 10 HTML5 Interview Questions and Answers. These are the most frequently asked interview questions for web developers. You will definitely feel that your understanding enhances after going through these important Interview Questions.  You can take a free online test for HTML5 at the end of this tutorial to validate your skill and further strengthen your level of understanding about latest HTML standard.
HTML5 Interview Questions

UPDATE: Although this tutorial targets top 10 most important and frequently asked HTML5 interview questions, but I have prepared an additional series of MUST HAVE Interview Questions on HTML5 as:

Also, I have added Recent HTML5 Web/Mobile Developers Jobs at the end of this article that will definitely help you finding your dream job.

HTML5 Interview Questions List

  1. What’s new HTML 5 DocType and Charset?
  2. How can we embed Audio in HTML 5?
  3. How can we embed Video in HTML 5?
  4. What are the new media element in HTML 5 other than audio and video?
  5. What is the usage of canvas Element in HTML 5?
  6. What are the different types of storage in HTML 5?
  7. What are the new Form Elements introduced in HTML 5?
  8. What are the deprecated Elements in HTML5 from HTML4?
  9. What are the new APIs provided by HTML 5 standard?
  10. What is the difference between HTML 5 Application Cache and regular HTML Browser Cache?

More Interview Questions on HTML5 ….

1.What’s new HTML 5 DocType and Charset?

Normally for HTML files first line of code is DocType which basically tells browser about specific version of HTML. HTML5 is now not subset of SGML. As compared to previous version/standards of HTML, DocType is simplified as follows:
                  <!doctype html>
And HTML 5 uses UTF-8 encoding as follows:
                 <meta charset=”UTF-8″>

You can see a very simple HTML5 page below:

HTML5 Sample PageBack to top

2.How can we embed Audio in HTML5?

HTML 5 comes with a standard way of embedding audio files as previously we don’t have any such support on a web page. Supported audio formats are as follows:

  • MP3
  • Wav
  • Ogg.

Below is the most simple way to embed an audio file on a web page.

<audio controls>
    <source src=”jamshed.mp3″ type=”audio/mpeg”>
    Your browser does’nt support audio embedding feature.

HTML5 Audio TagIn above code, src value can be relative as well as absolute URL. We can also use multiple <source> elements pointing to different audio files. There are more new attributes for <audio> tag other than src as below:

  • controls – it adds controls such as volume, play and pause.
  • autoplay – it’s a boolean value which specifies that audio will start playing once it’s ready.
  • loop – it’s also a boolean value which specifies looping (means it automatically start playing after it ends).
  • preloadauto, metadata and none are the possible values for this attribute.
    • auto means plays as it loaded.
    • metadata displays audio file’s associated data
    • none means not pre-loaded.

Back to top

3.How can we embed Video in HTML 5?

Same like audio, HTML 5 defined standard way of embedding video files which was not supported in previous versions/standards. Supported video formats are as follows:

  • MP4
  • WebM
  • Ogg

Please look into below sample code.

<video width=”450″ height=”340″ controls>
  <source src=”Racing.mp4″ type=”video/mp4″>
   Your browser does’nt support video embedding feature.

Embed HTML5 VideoSame like <audio>, <video> tag has associated optional attributes as controls, autoplay, preload, loop, poster, width, height and other global attributes etc. Controls, loop, preload and autoplay are already explained above. Others are explained below:

  • poster – it’s basically a URL of the image that needs to display until video get started.
  • width – video player width
  • height – video player’s height

Back to top

4.What are the new media element in HTML 5 other than audio and video?

HTML 5 has strong support for media. Other than audio and video tags, it comes with the following tags:

<embed> Tag: <embed> acts as a container for external application or some interactive content such as a plug-in. Special about <embed> is that it doesn’t have a closing tag as we can see below:

<embed type=”video/quicktime” src=””>

<source> Tag: <source> is helpful for multiple media sources for audio and video.

<video width=”450″ height=”340″ controls>
     <source src=”jamshed.mp4″ type=”video/mp4″>
     <source src=”jamshed.ogg” type=”video/ogg”>
<track> Tag: <track> defines text track for media like subtitles as:
<video width=”450″ height=”340″ controls>
     <source src=”jamshed.mp4″ type=”video/mp4″>
     <source src=”jamshed.ogg” type=”video/ogg”>
     <track kind=”subtitles” label=”English” src=”jamshed_en.vtt” srclang=”en” default></track>
      <track kind=”subtitles” label=”Arabic” src=”jamshed_ar.vtt” srclang=”ar”></track>

Back to top

5.What is the usage of canvas Element in HTML 5?

<canvas> is an element in HTML5 which we can use to draw graphics with the help of scripting (which is most probably JavaScript).
This element behaves like a container for graphics and rest of things will be done by scripting. We can draw images, graphs and a bit of animations etc using <canvas> element.

<canvas id=”canvas1″ width=”300″ height=”100″>

HTML5 Canvas

As canvas is considered to be the most exciting feature in HTML5, following resources can be helpful to ehnance one’s skill in this area. I have listed few good websites on HTML5 canvas as well as available tools and libraries:

  • Canvas From Scratch
    Starting from scratch and follow the step by step approach to take to advance level.

    • Introduction to Canvas in HTML5
    • Understanding advanced Drawing Topics
    • Tranformation, Shadows and Gradients in HTML5 Canvas
    • and finally Pixel Manipulation in Canvas
  • Mozilla Developer Network – MDN
    MDN acts a complete reference guide for HTML5 with detailed examples and code snippets.
  • HTML5 Canvas Tutorial
    Canvas Tutorial is a good tutorial site for learning basics of HTML5 canvas topics including Lines, Curves, Paths, Shapes, Filling Styles, Images, Text Manipulation, Tranformation, Composites and Animation etc.
  • PlayCanvas
    PlayCanvas is basically a WebGL Game Engine with a set of developer tools that can be used to develop 3D games for browser as well as mobiles.

For a more detailed reference to HTML5 Canvas resource, you can go to Emily Heming’s tutorial on this blog
Top 20 Resources You Need To Master HTML5 Canvas“.

Back to top

6.What are the different types of storage in HTML 5?

HTML 5 has the capability to store data locally. Previously it was done with the help of cookies.
Exciting thing about this storage is that its fast as well as secure.

There are two different objects which can be used to store data.

  • localStorage object stores data for a longer period of time even if the browser is closed.
  • sessionStorage object stores data for a specific session.



It persists data until we close the window or tab in which it was stored. It persist data even if the window or tab is closed (but can be explicitly removed or expires).
Values stored in sessionStorage are not shared. These will be visible only to respective window or tab. Values stored in localStorage are shared for all windows and tabs from same origin.
Maximum size is 5MB. Maximum size for localStorage is more between 10-15MB.

HTML5 localStorage Vs SessionStorageWorking with localStorage is quite simple and having following methods:

  • localStorage.getItem(key) -> fetch an item from storage against provided key.
  • localStorage.setItem(key, value) -> add an item to storage.
  • localStorage.removeItem(key) -> removes an item from storage against provided key.
  • localStorage.clear() -> clearing the storage removing all items from it.

Back to top

7.What are the new Form Elements introduced in HTML 5?

There are a number of new form elements has been introduced in HTML 5 as follows:

  • datalist provides functionality for auto-complete feature.
  • datetime facilitate selecting a datetime along with Time Zone.
  • output represents the result of a calculation.
  • keygen generates a key-pair field in a form to implement secure authentication.
  • date is an input field for date and applies validation accordingly.
  • month for selecting a month and year in a form input field.
  • week for selecting a week and year in an input field.
  • time is an input field for selecting time i.e. Hours:Minutes: AM/PM. For example, 10:30 AM.
  • color is an input field for color.
  • number that only allows numeric values.
  • range is an input field for selecting value within a specified range.
  • email is input field for email with standard email validations.
  • url is for an URL(Uniform Resource Locator) and validated accordingly.

Back to top

8.What are the deprecated Elements in HTML5 from HTML4?

Elements that are deprecated from HTML 4 to HTML 5 are:

  • frame
  • frameset
  • noframe
  • applet
  • big
  • center
  • basefront

Back to top

9.What are the new APIs provided by HTML 5 standard?

HTML 5 standard comes with a number of new APIs. Few of it are as follows:

  • Media API
  • Text Track API
  • Application Cache API
  • User Interaction
  • Data Transfer API
  • Command API
  • Constraint Validation API
  • History API
  • and many more….

Back to top

10.What is the difference between HTML 5 Application Cache and regular HTML Browser Cache?

One of the key feature of HTML 5 is “Application Cache” that enables us to make an offline version of a web application. It allows to fetch few or all of website contents such as HTML files, CSS, images, javascript etc locally. This feature speeds up the site performance. This is achieved with the help of a manifest file defined as follows:

<!doctype html>
<html manifest=”example.appcache”>

As compared with traditional browser caching, Its not compulsory for the user to visit website
contents to be cached.
Back to top

More Advanced HTML5 Interview Questions and Answers

Briefly explain cache manifest file in HTML5 with an example?

Cache manifest file is simply a text file that dictates the browser, what to store for offline access? It basically list down the required resources for offline access.


So, the resources mentioned in above manifest file (decorate.css, work.js, and amazing.jpg) will be downloaded and cached locally for offline access.

Note: Remember to add manifest attribute for each page of our website we want to be cached.

Back to top

Is it possible to get the geographical location of a user using HTML5?

Yes. It’s quiet possible to get the geographical location of a user using HTML5. As it has user’s privacy concerns so user’s approval needed. As we discussed above about new HTML5 API including Media API, Text Track API, Application Cache, User Interaction, Data Transfer API, Command API etc: HTML5 introduced new Geolocation API for locating a user’s position.

In order to get user position, getCurrentPosition() method is used as:


Above code simply provides an idea how we can retrieve geographical location of a user. But while providing professional implementation, we will get user approval and also handle errors accordingly.HTML5 GeoLocation API

If you want to integrate Google Maps in a Website or Mobile application like Android, iOS and don’t know how to integrate and create programs in Google Maps by using Google Maps JavaScript APIs? you can find this complete Video Course really helpful:

Using HTML5 and JavaScript, you will be:

  • able to setup Google Maps APIs
  • able to create Google Maps for devices
  • able to create Google Maps in a website
  • able to control the Maps UI events

For detailed course outline, follow here.

Back to top

What are HTML5 Semantic Elements? Explain with Example.

Semantic elements are those elements that clearly explains the purpose or meaning of the element to user (developer). For example, <div> and <span> elements in HTML doesn’t explain what they will contain as contents. On the other hand, <img> and <form> elements clearly explains the contents it can contain.

HTML5 introduces many new semantic elements with few are demonstrated in below diagram:HTML5 Semantic Elements

<header>, <nav>, <aside>, <section>, <article> and <footer> elements clearly explains the meaning of each element.

There are more semantic elements as listed below:

  • <details>
  • <figure>
  • <figcaption>
  • <main>
  • <mark>
  • <nav>
  • <summary>
  • <time>

Back to top

How to use HTML5 details and summary elements?

HTML5 details and summary element can be used collectively to produce the below collapse/Expanse affect as follows:HTML5 elements

Following is the source code of HTML5 details and summary element to produce above output.HTML5 Elements

Back to top

Article Vs Section tags in HTML5?

An <article> tag is a complete and independent piece of content of a document or page. For Example, this article about HTML5 interview Question is a complete and independent piece of content on this page that covers a specific topic.HTML5 Article Tag

On the other hand, <section> tag refers to specific section of a document or page for grouping purpose. For Example, at the end of this page, we have a specific section for related list of “Top Interview Questions And Answers Series”. Or in right nav, we have a section for “Top Posts and Pages” of this website.HTML5 Section Tag

An <article> can wrap a <section> to represents a sub-topic as follows:

<h1>Interview Questions Series</h1>
<p>List of Web Development Interview Question with detailed answers for web developers.</p>
<h1>HTML5 Interview Questions</h1>
<p>List of Interview Questions on HTML5</p>
<h1>JavaScript Interview Questions</p>
<p>List of Interview Questions on JavaScript</p>
<h1>ASP.NET MVC Interview Questions</p>
<p>List of Interview Questions on ASP.NET MVC</p>
Back to top

What is an HTML5 Web Worker?

Normally if some script is executing in an HTML page, the page remains unresponsive until the scripts execution stops. But an HTML5 web worker is a script (i.e. JavaScript) that keeps executing in background. At the same time user can interact with the page and will not feel any performance degradation.HTML5 Web Worker

HTML5 web worker normally exists in external files and used for long-running CPU intensive tasks but without affecting the User Interface or other scripts.
Back to top

What are the limitations of HTML5 Web Worker?

HTML5 Web worker seems to be very handy in many scenarios (especially for CPU intensive tasks) but it has certain limitations. Few JavaScript objects are not accessible to HTML5 web worker as:

  • parent object
  • window object
  • document object

Back to top

You are developing a customer web form that includes the following HTML.

<input id=”txtValue”/>

You need to change the HTML markup so that customers can enter only a valid three-letter country
code. Which HTML should you use?

  • A. <input id=”txtValue” type=”country”/>
  • B. <input id=”txtValue” type=”text” required=”xxx”/>
  • C. <input id=”txtValue” type=”text” pattern-” [A-Za-z] {3} “/>
  • D. <input id=”txtValuen type=”code” pattern”=”country”/>

For a complete HTML5 online test and Practice Exams, Click Here.

 Correct Answer: C

Canvas Vs SVG?

Following table clearly explains the difference between Canvas and SVG (Scalable Vector Graphics):



Only ONE HTML Element for rendering graphics i.e. canvas element Multiple Graphics Elements including (Circle, Rect, Boxes, Path, Line, Polygon etc.)
Draws Graphics on the fly using only Script i.e. JavaScript. Support Script as well as CSS.
Primarily based on Pixels. Based on Graphics elements as discussed above.
No manipulation using Event Handling due to pixel based interaction. Can manipulate by attaching event handlers to SVG elements.
Better in Performance. Slow in rendering when manipulating complex scenarios
Back to top

What are the new attributes introduced in HTML5 for <form> and <input> elements?

HTML5 being more richer having number of new attributes for <form> and <input> elements:

New attributes for <form> element are:

  • autocomplete – to set autocomplete “on” or “off”.
  • novalidate – not to be validated upon submit.

HTML5 Form Element
New attributes for <input> element are:

  • form
  • formaction
  • formenctype
  • formmethod
  • formnovalidate
  • formtarget
  • placeholder
  • step
  • required
  • pattern
  • autofocus
  • list
  • multiple
  • height and width
  • min and max

Back to top
Need more HTML5 Interview Questions? please follow a MUST HAVE Interview Questions series for HTML5 here.

More Related Articles

HTML5 Web/Mobile Developer Jobs [Updated Daily]

Recents HTML5 Jobs

HTML5 UX/UI Developer (Contractor)
Source: Bloomberg
Details: Job Requisition Number: 50127 How do we describe the design challenges posed by one of the world's most important financial software ecosystems? Complex and  More
5 days ago

New York, NY 21-June-2016

HTML5 UI/UX Developer (5131)
Source: Intercontinental Exchange, Inc.
Details: The HTML5 UI/UX Developer will report to the Senior Director of Enterprise Development and will be responsible for design, development, maintenance and support...  More
5 days ago

Atlanta, GA 30328 20-June-2016

HTML5 Developer
Source: High 5 Games
Details: You will be our HTML5/CSS/JS ninja with your key responsibility being to lead our HTML5 development, both for new games specifically designed for HTML5, as well...  More
7 days ago

New York, NY 10007 18-June-2016

Junior Developer
Source: SEIU 775 Benefits Group
Details: Organizational Overview At the SEIU 775 Benefits Group, we are leading the transformation of home care into a thriving career and helping to prevent the  More
5 days ago

Seattle, WA 20-June-2016

Creative HTML5 Developer
Source: American Greetings
Details: Creative HTML5 Developer:. The ideal candidate will work collaboratively with our creative design and developer teams to build compelling interactive content...  More
30+ days ago

Cleveland, OH 19-May-2016

WordPress Developer
Source: Indeed
Details: Proficient in HTML5, CSS3, JavaScript (jQuery) and PHP programming languages. Frequent Flyer Services is a travel industry related company specializing in...  More
5 days ago

Colorado Springs, CO 80915 20-June-2016

HTML5 Developer
Source: Infinitude Creative Group
Details: Experience with animation and coding HTML5 and/or Flash ActionScript is required. We are looking for an HTML5 Designer with strong visual design capabilities...  More
30+ days ago

Plano, TX 75093 13-May-2016

HTML5 Developer
Source: Indeed
Details: Strong HTML5 Skills. We are looking for a Freelance HTML5 Developer to help with some games and other projects....  More
5 days ago

Boston, MA 20-June-2016

Java/J2ee Developer with websphere .(only W2 And USC )
Source: Indeed
Details: Experience with Microsoft Team Foundation Server, SQL Server 2012, XML, Web Services, REST, JSON, HTML5, CSS3....  More
11 days ago

Washington, DC 14-June-2016

HTML5 Games Developer (Scotland)
Source: iWin, Inc.
Details: Create.JS, or similar HTML5 / Javascript engines. Using HTML5 canvas to deliver visually rich, interactive content....  More
30+ days ago

San Francisco, CA 03-May-2016

JavaScript/LAMP Stack Developer
Source: Indeed
Details: Hands on experience with HTML5, CSS3, and web technologies. JavaScript/LAMP Stack Developer*....  More
16 days ago

Hagerstown, MD 09-June-2016

Junior Front End Developer (Portland)
Source: Womply
Details: 1+ years of experience as a Front End/UI Developer building web applications using JavaScript, HTML5, and CSS3....  More
8 days ago

Portland, OR 17-June-2016

Junior Developer
Source: RAB Lighting
Details: Mobile development experience (native ios/ android, or hybrid HTML5, Cordova). RAB Lighting is growing rapidly and is seeking a Junior Developer who will be...  More
9 days ago

New York, NY 16-June-2016

Junior Android Developer
Source: iHerb
Details: Goodunderstanding of HTML5, JavaScript, jQuery, and Ajax. The Android Developer will ensure a qualityproduct by not only through writing code, but also by...  More
10 days ago

Irvine, CA 15-June-2016

Junior UX/UI Developer
Source: AVL Digital Group
Details: Should be proficient in UX/UI, HTML5, CSS, JavaScript, jQuery, mobile/responsive design. AVL Digital Group (dba Disc Makers and BookBaby)—a nationwide leader in...  More
10 days ago

Pennsauken, NJ 15-June-2016

GIS Developer-Junior-Level
Source: Indeed
Details: HTML5, JavaScript, CSS, and Python in conjunction with GIS-specific frameworks, toolkits, and code libraries....  More
11 days ago

Annapolis, MD 14-June-2016

Junior Web Developer
Source: Partner's Consulting, Inc.
Details: You will be working across multiple layers of the application stack with responsibility for everything, from database object creation to the implementation of...  More
11 days ago

Philadelphia, PA 14-June-2016

Website Developer - CMS Experience (Wordpress and e-commerce)
Source: Indeed
Details: Understanding of Python, html, html5, CSS, PHP, Jquery, Java, Ajax. Hi,....  More
25 days ago

Los Angeles, CA 90025 31-May-2016

Web Developer 2
Source: CompuCom ITWS
Details: HTML5, CSS / CSS3, JavaScript, BootStrap. Did you know that Gartner positioned CompuCom as a Leader in its Magic Quadrant for End User Outsourcing?...  More
2 days ago

Redmond, WA 23-June-2016

Junior Banners Developer - 50-75k
Source: Ingenium
Details: Elite Digital Production studio in Midtown Manhattan - adding a Junior Creative Developer to join our Technology team to develop and maintain responsive HTML5...  More
16 days ago

New York, NY 10001 09-June-2016

Junior Web Developer
Source: Applied Research Associates, Inc
Details: Advanced knowledge of HTML5 and CSS3. Advanced knowledge of HTML5 and CSS – the ability to hand-code web pages when needed....  More
19 days ago

Arlington, VA 07-June-2016

Front End Web Developer
Source: L4 Digital
Details: Expert CSS/LESS and HTML5 experience. At L4, we work with some of the world's leading companies to help them design, develop and deliver on their digital...  More
1 day ago

Seattle, WA 98104 25-June-2016

Junior Developer - ConceptDrop
Source: 1871
Details: Skilled in C#, HTML5 and Javascript. ConceptDrop (500 Startups Batch 17) is a venture-backed startup with a commitment to developing graphic design, and work...  More
19 days ago

Chicago, IL 07-June-2016

WordPress Developer PT
Source: Indeed
Details: Proficient in HTML5, CSS3, JavaScript (jQuery) and PHP programming languages. Frequent Flyer Services is a travel industry related company specializing in...  More
30 days ago

Colorado Springs, CO 80915 26-May-2016

Junior Developer
Source: Eze Software Group
Details: MS is a plus.•Solid understanding of object oriented design and programing, relational Databases, Design patterns.•Interest or experience building GUIs in HTML5...  More
21 days ago

Boston, MA 04-June-2016

HTML5 Online Test

Top 10 Interview Questions and Answers Series:

Category: HTML 5 Interview Questions Web Development Tags: ,


Imran Abdul Ghani is working as Software Developer(Senior) with extensive knowledge in Web development technologies especially C#, ASP.NET, MVC, WCF, Web API, ADO.NET Entity Framework, jQuery etc. He has several years of experience in designing/developing enterprise level applications. He is Microsoft Certified Solution Developer for .NET (MCSD.NET) since 2005. You can reach his blogging at,, and