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HTML5 Test Answers

HTML5 oDesk Test 2015 Answers

1 : Assuming that some text needs to be written on an HTML5 canvas, select a replacement for the commented line below:
<canvas id=”e” width=”200″ height=”200″></canvas>
var canvas = document.getElementById(“e”);
//insert code here
context.fillStyle = “blue”;
context.font = “bold 16px Arial”;
context.fillText(“Zibri”, 100, 100);

c) canvas.getContext(“2d”);

2  Can we store JavaScript Objects directly into localStorage?
b) No

3  Consider 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?

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?

a) ctx.drawImage(img,10,10);

5  How can an HTML5 canvas size be changed so that it fits the entire window?

Answer - b) <script type=”text/javascript”>

        function resize_canvas(){

            canvas = document.getElementById(“canvas”);

            if (canvas.width  < window.innerWidth)
             width = window.innerWidth;
            if (canvas.height < window.innerHeight)
            height = window.innerHeight;

6  How can audio files be played in HTML5?
var sound = new Audio(“file.wav”);

d) sound.play();
7   How does a button created by the <button> tag differ from the one created by an <input> tag?
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>
a)  button

9  Once an application is offline, it remains cached until the following happens (select all that apply):

a) The application cache is programmatically updated.

c) The manifest file is modified.

d) The user clears their browser’s data storage for the site.

10 The following are valid use cases of client file/directory access in HTML5, except:

c) Use of the HTML5 File API

11 The following link is placed on an HTML webpage:

<a href=”http://msdn.com/&#8221; 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.

a) True
13 True or false:

JavaScript objects can be stored directly into localStorage.

b) False

14 What does P2P streaming mean when web applications establish a P2P HTTP connection using HTML?

a) It means that streaming of a voice/video frame is direct, without using any server between them.

15 What is the difference between Server-Sent Events (SSEs) and WebSockets in HTML5?

a) WebSockets can perform bi-directional (client-server and vice versa) data transfers, while SSEs can only push data to the client/browser.

16 What is the internal/wire format of input type=”date” in HTML5?


17 What is the limit to the length of HTML attributes?

c) There is no limit.

18 What is the purpose of the <q> element in HTML5?

c) It is used to define the start of a short quotation.

19 What is the role of the <dfn> element in HTML5?

d) It is used to define a definition term.

20 When does the ondragleave mouse event get fired in HTML5?

b) It gets fired when an element leaves a valid drop target.

21 Which event is fired when an element loses its focus in an HTML5 document?

c) onblur

22 Which following are valid default values for the <input type=”date”> HTML5 element?

b) 2013-05-30

23 Which HTML5 doctype declarations are correct?

b) <!DOCTYPE html>

24  <pre>Which is the standard method for clearing a canvas?</pre>

a) context.clearRect ( x , y , w , h );

25 Which media event is triggered when there is an error in fetching media data in HTML5?

a) onstalled

26 Which media event will be fired when a media resource element suddenly becomes empty?

d) onemptied

27 . Which method of HTMLCanvasElement is used to represent image of Canvas Element?

a) toDataURL()

28  Which method of the HTMLCanvasElement is used to represent an image of a canvas element?

a) toDataURL

29 Which of the following <link> attributes are not supported in HTML5?

b) rev
30. Which of the following are sample use cases for HTML5 web workers?

d) All of these.

31 Which of the following are the valid values of the <a> element’s target attribute in HTML5?

a) _blank

b) _self

c) _top

      32 & 33 not sure about the answers

34 Which of the following attributes gets hidden when the user clicks on the element that it modifies? (Eg. hint text inside the fields of web forms)

c) placeholder

35. Which of the following code is used to prevent Webkit spin buttons from appearing on web pages?

b) input[type=number]::-webkit-inner-spin-button,

   input[type=number]::-webkit-outer-spin-button {

   -webkit-appearance: none;

   margin: 0; }

36.  Which of the following examples contain invalid implementations of the ampersand character in HTML5?

c) foo &0; bar

37.  Which of the following HTML5 features is capable of taking a screenshot of a web page?

c) Canvas

38. Which of the following is a possible way to get fullscreen video played from the browser using HTML5?
C) <video height=”100%” width=”100%”>

39. Which of the following is not a valid attribute for the <video> element in HTML5?

c) disabled

40  Which of the following is not a valid syntax for the <link> element in HTML5?

b) <link rev=”stylesheet” href=”abc.css” type=”text/css” target=”_parent”>

41. Which of the following is the best method to detect HTML5 Canvas support in web browsers?

d) !!window.HTMLCanvasElemen

42 Which of the following is the best method to store an array in localStorage?

b) var names = []; names[0] = prompt(“New member name?”);

   localStorage[“names”] = JSON.stringify(names);

   var storedNames = JSON.parse(localStorage[“names”]);

43. Which of the following is the correct way to check browser support for WebSocket?

b) console.log(window.WebSocket ? ‘supported’ : ‘not supported’);

44. Which of the following is the correct way to display a PDF file in the browser?

a) <object type=”application/pdf” data=”filename.pdf” width=”100%” height=”100%”/>

45.  Which of the following is the correct way to play an audio file in HTML5?

b) <audio controls>

   <source src=”file.ogg” type=”audio/ogg”>

   <source src=”file.mp3″ type=”audio/mpeg”>


46. Which of the following is the correct way to store an object in a localStorage?

a) localStorage.setItem(‘testObject’, JSON.stringify(testObject))

47.  Which of the following is the correct way to store an object in localStorage?

var obj = { ‘one': 1, ‘two': 2, ‘three': 3 };

b) localStorage.setItem(‘obj’, JSON.stringify(obj));

48. Which of the following methods can be used to estimate page load times?

a) Using _gaq.push([‘_trackPageLoadTime’]) with Google Analytics.

49. Which of the following shows correct use of client-side data validation in HTML5, on username and password fields in particular?

a) <input name=”username” required />

   <input name=”pass” type=”password” required/>

50. Which of the following statements are correct with regard to the <hr> and <br> elements of HTML5?

b) The <hr> element is used to insert the horizontal line within the document and the <br> element is used to insert a single line break.

51. Which of the following statements regarding WebSockets is true?

d) All of the above.

52. Which of the following video file formats are currently supported by the <video> element of HTML5?

b) MPEG 4

53. Which of the following video tag attributes are invalid in HTML5?

d) pause

54. Which of the following will detect when an HTML5 video has finished playing?

a) var video = document.getElementsByTagName(‘video’)[0];

onended = function(e) { }

55. Which of the following will restrict an input element to accept only numerical values in a text field?

a) <input type=”text” pattern=”[0-9]*” />

<input type=”number” />

<input type=”text” pattern=”\d*”/>

56.  You are writing the code for an HTML form and you want the browser to retain the form’s input values. That is, if a user submits the form and presses the browser’s back button, the fully populated form is displayed instead of a blank form. Which of the following HTML 5 attributes will you use?

b) autofocus

c) autocomplete