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What does the following code do? let el = document.getElementsByTagName("p"); if (el.length > 0) {     el[el.length - 1].style.fontFamily = "Helvetica sans-serif"; }   a. It clears the page. b. Removes the font style from the first paragraph element. c. It does nothing because it has an array-index-out-of-bounds error. d. Adds a new paragraph with the words "Helvetica sans-serif". e. Sets the font of the last paragraph element in the page.

What does the following code do? let el = document.getElementsByTagName("p"); if (el.length > 0) {     el[el.length - 1].style.fontFamily = "Helvetica sans-serif"; }   a. It clears the page. b. Removes the font style from the first paragraph element. c. It does nothing because it has an array-index-out-of-bounds error. d. Adds a new paragraph with the words "Helvetica sans-serif". e. Sets the font of the last paragraph element in the page.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question

What does the following code do?

let el = document.getElementsByTagName("p");
if (el.length > 0) {
    el[el.length - 1].style.fontFamily = "Helvetica sans-serif";
}
 
a.
It clears the page.
b.
Removes the font style from the first paragraph element.
c.
It does nothing because it has an array-index-out-of-bounds error.
d.
Adds a new paragraph with the words "Helvetica sans-serif".
e.
Sets the font of the last paragraph element in the page.
Expert Solution
Step 1

Hi.

 

Let's first understand what document.getElementsByTagName does.

 

As the name suggests, getElementsByTagName will get you all the elements matching the provided tag name from the document.

 

For example, document.getElementsByTagName("p") will return a list or array of all the paragraph elements from the document.

Similarly, document.getElementsByTagName("a") will return a list or array of all the anchor elements from the document.

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