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HTML for Front-end Interviews

DOM Fundamentals

Explore the fundamentals of the Document Object Model (DOM) to understand its structure and how to manipulate elements and handle events effectively. This lesson equips you with essential skills to work confidently with HTML5 and JavaScript in front-end development and interview scenarios.

We'll cover the following...

A structured assessment

Question 1:

1.

What is the main function of the DOM?

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Question 2:

1.

Please specify the syntax of the UI Object Identifier used by the DOM Extension.

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Question 3:

1.

What is the purpose of the HTML5 DOM node tree?

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Question 4:

1.

List the main class of methods involved in the HTML DOM.

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Question 5:

1.

What is the function of the DOM according to the W3C standards?

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Question 6:

1.

What are the different levels involved in the DOM?

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An MCQ assessment

Technical Quiz
1.

Which of the following are ways to get an element from the DOM? Multi-select

A.

getElementById

B.

getNode

C.

getElements

D.

querySelector

1 / 4

Code analysis questions

Code analysis 1:

Study the following code:

HTML
<html>

 <head>

 </head>

 <body>

   <form>  

     Enter No:<input type="text" id="number" value="3" name="number"/><br/>  

     <input type="button"  value="ok" onclick="getcube()"/>  

</form>

 </body>

</html>
Javascript (babel-node)
function getcube()

{  

    var number=document.getElementById("number").value;  

    alert(number*number*number);  

}
Technical Quiz
1.

What will be the output of the above code?

A.

9

B.

27

C.

An error will occur

D.

undefined

1 / 1

Code analysis 2:

Study the following code:

HTML
<html>

 <head>

 </head>

 <body>

  <form>  

     <input type="radio" name="gender" value="male">  

     <input type="radio" name="gender" value="female">  

     <input type="button" onclick="totalelements()" value="Total Genders">  

  </form>

 </body>

</html>
Javascript (babel-node)
function totalelements()  

{  

    var allgenders=document.getElementsByName("gender");  

    alert(allgenders.length);  

}
Technical Quiz
1.

What will be the output of the above code?

A.

0

B.

hello

C.

h2

D.

2

1 / 1

Code analysis 3:

Study the following code:

HTML
<html>

 <head>

 </head>

 <body>

   <form >  

    <input name="myForm" type="password"  onkeyup="checkPass()">  

      Strength:<span id="mylocation"> no strength</span>  

  </form>

 </body>

</html>
Javascript (babel-node)
function checkPass() 

{  

    var msg; 

    

    if(document.getElementsByName("myForm").length)

    {  

        msg="password added";  

    }  

    else

    {  

         msg="no password added";  

    }  

    

    document.getElementById('mylocation').innerText=msg;  

}
Technical Quiz
1.

What will be the output of the above code when the user types an input?

A.

"no password added"

B.

"password added"

C.

"no strength"

D.

undefined

1 / 1

Code analysis 4:

Study the following code:

HTML
<html>

 <head>

 </head>

 <body>

   <form name="myForm">   

      <input type="button" value="comment" onclick="showcommentform()">  

      <div id="mylocation"></div> 

    </form> 

 </body>

</html>
Javascript (babel-node)
function showcommentform() 

{  

    var data="new text" 

    document.getElementById('mylocation').innerHTML=data;  

}
Technical Quiz
1.

What will be the output of the above code?

A.

comment

B.

new text

C.

An error will occur

D.

undefined

1 / 1

Checkpoint Reached: Mastering DOM fundamentals in HTML5 – completed! ✔️