The video tutorial covers the use of selectors in HTML, focusing on classes and IDs. It explains how selectors can be used to target elements for styling, with IDs being unique identifiers for specific elements. The tutorial includes a practical demonstration of using IDs to change the background color of an element and discusses the importance of using IDs for unique elements like footers. The session concludes with a summary of the concepts covered and a preview of the next lesson.

What is the primary purpose of an ID in HTML?

• To apply styles to multiple elements

• To create a list of elements

• To uniquely identify a single element

• To define a group of elements

How do you reference an element with an ID in CSS?

• Using a colon (:) followed by the ID name

• Using a hash (#) followed by the ID name

• Using an asterisk (*) followed by the ID name

• Using a period (.) followed by the ID name

Why must an ID be unique on a single HTML page?

• To prevent conflicts in JavaScript and CSS

• To ensure consistent styling across elements

• To enable the use of the same ID on different pages

• To allow multiple elements to share the same style

In what scenario would you use an ID instead of a class?

• When styling multiple elements with the same style

• When targeting a single, unique element

• When creating a list of items

• When applying styles to a group of elements

What is a key difference between IDs and classes in HTML?

• IDs can be reused on multiple elements, classes cannot

• Classes are unique to each element, IDs are not

• IDs are unique to each element, classes can be reused

• Classes are used for JavaScript, IDs are not