Learn JavaScript from Scratch JavaScript for Everyone - Selecting Elements by Their IDs

The video tutorial explains how to select and manipulate HTML elements using their IDs in JavaScript. It covers the use of the getElementById method to access elements and modify their inner text and HTML. The importance of unique IDs in HTML is emphasized, and a practical experiment is suggested to reinforce learning.

What is the primary purpose of using an ID in HTML?

• To define a class for multiple elements

• To create a hyperlink

• To uniquely identify an element for JavaScript manipulation

• To style elements with CSS

Which JavaScript method is used to select an element by its ID?

• document.querySelector

• document.getElementsByClassName

• document.getElementsByTagName

• document.getElementById

What happens when you set the innerHTML of an element?

• It changes the ID of the element

• It changes only the text content of the element

• It changes the HTML structure within the element

• It deletes the element

Why should IDs be unique within an HTML document?

• To improve page loading speed

• To enhance SEO performance

• To avoid conflicts in CSS styling

• To ensure correct element selection in JavaScript

What is the difference between innerText and innerHTML?

• innerText includes HTML tags, innerHTML does not

• innerHTML includes HTML tags, innerText does not

• Both include HTML tags

• Neither includes HTML tags