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Tuesday, April 23, 2013

Top 10 HTML 5 Interview Questions

It's a collection of selected top 10 HTML5 Interview Questions and Answers. These are the most frequently asked interview questions for web developers.

1.What's new HTML 5 DocType and Charset?
As HTML 5 is now not subset of SGML so its DocType is simplified as follows:
                  <!doctype html>
And HTML 5 uses UTF-8 encoding as follows:
                 <meta charset="UTF-8">

2.How can we embed Audio in HTML 5?
HTML 5 comes with a standard way of embedding audio files. Supported audio formats are MP3, Wav and Ogg.
<audio controls>
    <source src="jamshed.mp3" type="audio/mpeg">
    Your browser does'nt support audio embedding feature.
</audio>

3.How can we embed Video in HTML 5?
Same like audio, HTML 5 defined standard way of embedding video files.Supported video formats are MP4, WebM and Ogg.

<video width="450" height="340" controls>
  <source src="jamshed.mp4" type="video/mp4">
   Your browser does'nt support video embedding feature.
</video>

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> acts as a container for external application.
  • <track> defines text track for media.
  • <source> is helpful for multiple media sources for audio and video.

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>

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.

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
  • datetime
  • output
  • keygen
  • date
  • month
  • week
  • time
  • number
  • range
  • email
  • url

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

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....

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">
.....
</html>

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



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By Imran Ghani
Software Developer (Senior)
United Arab Emirates
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.

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