oDesk HTML 5 Test Answers 2014

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1. 1.       Assuming that some text needs to be written on an HTML5 canvas, select a replacement for the commented line below:
2. <canvas id=”e” width=”200” height=”200”></canvas>
   <script>
        Var canvas = document.getElementById(“e”);
        //insert code here
        context.fillstyle = “blue”;
        context.font = “bold 16px Arial”;
        context.fillText (“Zibri”, 100, 100);
   </script>
   Ans: c. var context = canvas.getContext(“2d”);
   
   
   2.       Can we store JavaScript Objects directly into localStorage?
   
   
   Ans: b. No
   
   
   3.       For the following items of a <select> list:
   <option value="89">Item 1</option>
   <option value="90">Item 2</option>
   Which of the following values would be passed on by clicking the submit button on selecting Item 2 from the list?
   
   
   Ans: b. 90
   
   
   4.       Consider the following javascript code:
   var c=document.getElementById(“myCanvas”);
   var ctx=c.getcontext(“2d”);
   var img=document.getElementById(“img”);
   
   
   Which method will correctly draw an image in the  x=10, y=10 position?
   
   Ans:a.       Ctx.drawImage(img, 10, 10);
   
   
   5.       How can an HTML5 canvas size be changed so that it fits the entire window?
   
   Ans: b. <script type=”text/javascript”>
                 function resize_canvas() {
                          canvas = document.gatElementById(“”canvas);
                         if (canvas.width < window.innerWidth)
                         {
                              Canvas.width = window.innerWidth;
                         }
                        if (canvas.height < window.innerHeight)
                         {
                              Canvas. height = window.innerHeight;
                         }
                }
   </script>
   
   
   
   
   6.       How can audio files be played in HTML5? 
   var sound = new Audio("file.wav");
   Ans: d. Sound.play();
   
   
   7.       How does a button created by the <button> tag differ from the one created by an <input> tag?
   
   
   Ans: d. A button tag can include images as well.
   
   
   8.       In HTML5, which of the following is not a valid value for the type attribute when used with the <command> tag shown below?  <command type="?">Click Me!</command>
   
   
   Ans: a.       Button
   
   
   9.       Once an application is offline, it remains cached until the following happens (select all that apply):
   
   
   Ans: b.       The manifest file is modified
   
   
   10.   The following are valid use cases of client file/directory access in HTML5, except:
   
   
   Ans: c.        Use of HTML5 File API
   
   
   
   
   11.   The following link is placed on an HTML webpage: 
   <a href="http://msdn.com/" target="_blank"> MSDN </a> 
   What can be inferred from it
   b. It will open the site msdn.com in a new window.
   
   
   12.   True or False:
   HTML5 Canvas can be used to create images.
   
   
   Ans: a. True
   
   
   
   
   13.   What does p2p streaming mean when web applications establish a p2p HTTP connection using HTML?
   
   Ans: a. It means that streaming of a voice/video frame is direct, without using any server between them.
   
   
   14.   What is the difference between server-sent Events (SSEs) and websockets in HTML?
   
   
   Ans: a. Websockets can perform bi-directional (client-server and  vice versa) data transfers, while SSEs can only push data to the client/browser.
   
   
   15.   What is the internal/wire format of input type=”date” in HTML5?
   
   
   Ans: a. YYYY-MM-DD
   
   
   16.   What is the limit to the length of HTML attributes?
   
   
   Ans: a. There is no limit
   
   
   17.    What is the role of the <dfn> element in HTML5?
   
   
   Ans: b. It is used to define a definition term
   
   
   18.    When does the ondragleave mouse event get fired in HTML5?
   
   
   Ans:b.  It gets fired when an element leaves a valid drop target
   
   
   19.    Which event is fired when an element loses its focus in an HTML5 document?
   
   
   Ans:c. Onblur
   
   
   20.    Which following are valid default values for the <input type="date"> HTML5 element?
   
   
   Ans: b. 2013-05-30
   
   
   21.    Which HTML5 doctype declarations are correct?
   
   
   Ans: c. <!DOCTYPE html>
   
   
   22.    Which is the standard method for clearing a canvas?
   
   
   Ans: a. context.clearRect ( x, y, w, h);
   
   
   23.    Which media event is triggered when there is an error in fetching media data in HTML5?
   
   
   Ans: a.Onstalled
   
   
   24.    Which media event will be fired when a media resource element suddenly becomes empty?
   
   
   Ans: c. Onemptied
   
   
   25.    Which method of HTMLCanvasElement is used to represent image of Canvas Element?
   
   
   Ans: a. toDataURL()
   
   
   26.    Which of the following <link> attributes are not supported in HTML5?
   
   
   Ans: a. Rev,  d.charset
   
   
   27.    Which of the following are sample use cases for HTML5 web workers?
   
   
   Ans: d. All of these
   
   
   28.   Which of the following are the valid values of the <a> element's target  attribute in HTML5?
   
   
   Ans: a._blank
              b. _self
              c. _top