Top 10 HTML5 Interview Questions

By | April 23, 2013
Share on FacebookShare on Google+Tweet about this on TwitterShare on LinkedInDigg thisPin on Pinterest
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 HTML5 Interview Questions and Answers

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.
</audio>

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.
</video>

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=”Fishing.mov”>

<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”>
</video>
<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>
</video>

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″>
</canvas>

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.

sessionStorage

localStorage

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:

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

In order to achieve Application Cache feature in HTML5, a manifest file is used as follows:

Manifest file is basically a text file that dictates what needs to be cache or not if Application Cache is enabled. Followings are the four main sections of a manifest file where CACHE MANIFEST is the only required section:

  • CACHE MANIFEST
  • CACHE
  • NETWORK
  • FALLBACK

HTML5 Application Cache Manifest
Back to top

More Advanced HTML5 Interview Questions and Answers

 

What is Web Forms 2.0 in HTML5?

Forms Section in HTML5 is known as Web Forms 2.0. It’s basically an extension to HTML4 forms features. Web Forms 2.0 in HTML5 provides comparatively a greater degree of semantic markups than HTML4 as well as removing the need of lengthy and tedious scripting and styling, as a result making HTML5 more richer but simpler in use.
Back to top

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.

CACHE MANIFEST
/decorate.css
/work.js
/amazing.jpg

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:

                  navigator.geolocation.getCurrentPosition(show_map);

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:

<article>
<h1>Interview Questions Series</h1>
<p>List of Web Development Interview Question with detailed answers for web developers.</p>
<section>
<h1>HTML5 Interview Questions</h1>
<p>List of Interview Questions on HTML5</p>
</section>
<section>
<h1>JavaScript Interview Questions</p>
<p>List of Interview Questions on JavaScript</p>
</section>
<section>
<h1>ASP.NET MVC Interview Questions</p>
<p>List of Interview Questions on ASP.NET MVC</p>
</section>
</article>
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):

Canvas

SVG

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

What is a placeholder attribute in HTML5?

New placeholder attribute in HTML5 acts as a hint for input field value. It provides a kind of facilitating text for a description or expected type of value or an expected format of the value. For example, “Student Name” hints for a textbox expecting student name or “000-0000000″ hints for an expected phone number format etc.

HTML5 placeholder attribute

placeholder attribute is applicable to following input types:

  • text
  • password
  • email
  • url
  • search
  • tel

Back to top

What is a draggable attribute in HTML5?

In order to make an element draggable, HTML5 introduces draggable attribute. By default, Links and Images are draggable. If we want to make a paragraph or a span element draggable, will set the draggable attribute of that specific element to true as:

 

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

More Web Development Related Articles


HTML5 Web/Mobile Developer Jobs [Updated Daily]

Recents HTML5 Jobs

UI/UX/Front-end Developer
Source: Indeed
Details: Development experience in or willing to learn front end technologies such as HTML5, Javascript, CSS3, SASS, Angular JS, Google Polymer, Backbone, SCSS, LESS etc...  More
12 days ago

Seattle, WA 98104 08-August-2017

UI/PHP Developer
Source: Indeed
Details: Javascript, css, jquery, Angular, HTML5, PHP*. Greetings from 8kmiles....  More
2 days ago

New York, NY 18-August-2017

UI Developer
Source: Indeed
Details: JavaScript, HTML5, CSS, Angular 2, Bootstrap, Java/J2EE Framework, Ajax, JSON, and restful web services. UI Developer Location;...  More
2 days ago

Atlanta, GA 18-August-2017

UI Developer W/ Redux
Source: Indeed
Details: UI design, development, and maintaining/updating existing projects Delivering high quality, responsive, HTML5, CSS3 and JavaScript components.*....  More
2 days ago

Phoenix, AZ 18-August-2017

UI/UX Developer
Source: Indeed
Details: Proficient understanding of web markup, including HTML5, CSS3, Flexbox. SoftSages Technology !!...  More
2 days ago

Boca Raton, FL 18-August-2017

UI Developer
Source: Indeed
Details: JavaScript, HTML5, CSS, Angular 2, Bootstrap, Java/J2EE Framework, Ajax, JSON, and restful web servicesA working knowledge of design patterns and service...  More
2 days ago

Atlanta, GA 18-August-2017

Sr. UI Developer
Source: Indeed
Details: Microsoft Azure, C#, .net framework core (4.6.1 and higher), MVC 5, Web API, REST ,Entity Framework, SignalR, SQL server 2016, Kendo UI API, HTML5, CSS,....  More
3 days ago

Houston, TX 17-August-2017

Looking for UI Developer at Ann Arbor, MI (Must be local)
Source: Indeed
Details: *Location- Ann Arbor, MI* *Title – UI Developer* *Interview- Must go onsite after phone interview (the client will NOT provide cost for f2f interview)* *No...  More
4 days ago

Mount Pleasant, MI 48859 16-August-2017

Front End UI Developer
Source: Indeed
Details: Experience with HTML5, CSS3, JQuery/Bootstrap, and JSONE. We are a start-up currently developing an ERP software application that will require us to create...  More
5 days ago

Remote 15-August-2017

UI Developer
Source: Indeed
Details: Html5, CSS and Javascript:. HTML 5, Java Script, CSS 3, JSON, Ajax, XAML, jQuery, Bootstrap, Angular, React and other modern frameworks....  More
5 days ago

Detroit, MI 15-August-2017

Sr. UI Developer - Englewood, NJ 45/Hr
Source: Indeed
Details: JavaScript, Angular 2, Node.js, Express, HTML5, CSS3, Git Personal Skills:. Hi,....  More
6 days ago

Englewood, NJ 15-August-2017

UI Developer
Source: Indeed
Details: JavaScript, Angular 2, Node.js, Express, HTML5, CSS3, and Git. Experience with client side technologies including Angular, Node.js, HTML5, and CSS3 and advanced...  More
6 days ago

San Diego, CA 14-August-2017

UI/UX Developer
Source: Indeed
Details: JavaScript, HTML5, CSS3, REST API, MySQL, Selenium, Websphere Commerce, Karma, Mocha. Hi,*....  More
6 days ago

Melville, NY 14-August-2017

Sr. UX/UI Developer
Source: Indeed
Details: Strong front-end development skills using HTML5, JavaScript, jQuery and Knockout (or other MVVM Foundation)....  More
11 days ago

Costa Mesa, CA 10-August-2017

UI Developer
Source: Indeed
Details: Expert level familiarity with HTML5, JavaScript, CSS3, SVG. About 5 years experience developing user interfaces for an enterprise application....  More
11 days ago

Fremont, CA 94538 09-August-2017

UI/UX developer
Source: Indeed
Details: Proficiency in HTML5, CSS3, JavaScript. Job Description – UI/UX Developer*....  More
11 days ago

San Luis Obispo, CA 09-August-2017

UI Developer
Source: Indeed
Details: Developing UIs in jQuery, CSS, HTML5, Handlebar, JavaScript, and Web services:. 3 to 5 years of experience with developing UIs in jQuery, CSS, HTML5, Handlebar,...  More
18 days ago

Alexandria, VA 02-August-2017

Front End / UI Developer
Source: Indeed
Details: Proficient with HTML, HTML5, CSS, CSS3, JSON, AJAX. Front End / UI Developer....  More
18 days ago

New York, NY 02-August-2017

Sr. UI/UX Developer
Source: Indeed
Details: Working proficiency of the HTML5 data attributes. UX/UI Lead Developer with emphasis on Mobile Development*....  More
19 days ago

Tampa, FL 01-August-2017

SR. UI Developer
Source: Indeed
Details: This role requires hands-on software development skills, deep technical expertise in web development, especially in developing HTML5, CSS3 and Object oriented...  More
23 days ago

Englewood, NJ 28-July-2017

UI and API Developer _Cloud storage expert
Source: Indeed
Details: Must have the working experience with Javascript, Angular 2, Typescript, HTML5 and CSS3. UI and API Developer*....  More
27 days ago

Houston, TX 24-July-2017

Frontend/UI Developer
Source: Indeed
Details: Experience with web languages/technologies including HTML5, CSS3, Responsive Web Design, Angular, jQuery, Ajax, JSON, etc....  More
30+ days ago

Minneapolis, MN 07-July-2017

Report Developer (Sql,Oracle,Crystal Reports)
Source: Indeed
Details: *Minimum 60 Months* Experience with SQL, PL/SQL, XML, stored procedures, functions, packages, and triggers and views. *Minimum 60 Months* Experience writing...  More
5 days ago

Albany, NY 15-August-2017

UI Developer
Source: Indeed
Details: HTML5 including HTML5 API’s. Knowledge of expanded HTML5 semantics and popular HTML5 APIs (e.g. 2+ years of experience with HTML5 and CSS3 and popular page...  More
30+ days ago

Edison, NJ 08820 29-June-2017

Full-time Adobe ColdFusion Developer with Front-end (UX/UI) Experience
Source: Indeed
Details: Minimum of 3 years of experience with HTML5, CSS3 and JavaScript/jQuery. USC Gould School of Law is looking for an experienced Adobe ColdFusion developer with...  More
30+ days ago

Los Angeles, CA 90089 27-June-2017

HTML5 Online Test

Top Web Developer Interview Questions and Answers Series:

Share on FacebookShare on Google+Tweet about this on TwitterShare on LinkedInDigg thisPin on Pinterest
Category: HTML 5 Interview Questions Web Development Tags: ,

About Web Development

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 www.webdevelopmenthelp.net, www.topwcftutorials.net, and www.sharepointfordummies.net.