#HTML5 Interview Questions and Answers. 10 commonly asked questions

I have listed 10 most commonly asked HTML5 interview questions and answers during Front end developer interview. Speaking of HTML5 used on mobile devices ; get familiar yourself with Android 5.0 Lollipop features which is one of the hot topic these days!

HTML5 is becoming very important technology since Safari doesn t support Flash by default. Users need to enable and install flash plugin into their browsers. Same way, Chrome OS and Chrome browser do not support Flash either.

That is why HTML5 is becoming more and more popular. HTML5 is compatible since supported by cross-browser platforms as well.

If you love Questions and Answers on this page; and if you are preparing for an interview, I d strongly recommend reading HTML5 and CSS3 All-in-one For Dummies book by Andy Harris. I really liked this book and found very helpful preparing for interviews.

READ : Javascript interview Questions Answers. 10 Commonly asked Questions

(1) What is the use of Canvas Element in HTML5?

HTML5 Canvas element can be used to draw graphics images on a web page by using javascript.

(2) Can you give an example of Canvas element how it can be used?

canvas id=“DGTCanvas” width=“500″ height=“400″

/canvas

script type=“text/javascript”

var DGTCanvas=document.getElementById(“DGTCanvas”);

var DGTText=DGTCanvas.getContext(“2d”);

DGTText.fillStyle=“#82345c”;

DGTText.fillRect(0,0,150,75);

/script

This book is far better than any other learning material. It has very basic information that includes both HTML5 and CSS3 with sample code and comprehensive examples.

(3) What is the purpose of HTML5 versus XHTML?

HTML5 is the next version of HTML 4.01, XHTML 1.0 and DOM Level 2 HTML. It aims to reduce the need for proprietary plug-in-based rich internet application (RIA) technologies such as Adobe Flash, Microsoft Silverlight, Apache Pivot, and Sun JavaFX. Instead of using those plugins, it enables browser to serve elements such as video and audio without any additional requirements on the client machine.

Related article on DGlobalTech.com

(4) What is the difference between HTML and HTML5 ?

HTML5 is nothing more then upgraded version of HTML where in HTML5 supports the innovative features such as Video, Audio/mp3, date select function. placeholder. Canvas, 2D/3D Graphics, Local SQL Database added so that no need to do external plugin like Flash player or other library elemenents.

(5) WHAT are some other advantages of HTML5?

a) Cleaner markup than earlier versions of HTML

b) Additional semantics of new elements like  header , nav , and time

c) New form input types and attributes that will (and in Opera’s case, do) take the hassle out of scripting forms.

(6) What is the   !DOCTYPE ? Is it mandatory to use in HTML5?

The !DOCTYPE is an instruction to the web browser about what version of HTML the page is written in. The !DOCTYPE tag does not have an end tag. It is not case sensitive.

The !DOCTYPE declaration must be the very first thing in HTML5 document, before the html tag.  As In HTML 4.01, all ! DOCTYPE declarations require a reference to a Document Type Definition (DTD), because HTML 4.01 was based on Standard Generalized Markup Language (SGML). WHERE AS HTML5 is not based on SGML, and therefore does not require a reference to a Document Type Definition (DTD).

(7) What are the New Media Elements in HTML5?