Advanced Selectors

Hello, everyone! Welcome to the Advanced Selectors lesson.

In this lesson, we will learn about CSS selectors that allow us to target HTML elements in more specific ways. We will explore pseudo-class selectors, attribute selectors, pseudo-element selectors, and combined selectors.

What are Advanced Selectors?

Advanced selectors are CSS selectors that enable us to target HTML elements in more specific ways.

They can be used to select elements based on their state, attributes, or content.

Why Use Advanced Selectors?

Advanced selectors can be used to:

• Apply styles to specific elements
• Create more complex visual effects
• Improve CSS efficiency

Pseudo-Class Selectors

Pseudo-class selectors allow us to select elements based on their state.

For example, you can use a pseudo-class selector to target an element when it is in focus or when the mouse is over it.

Example:

The following CSS code selects all buttons that are in focus:

button:focus {
  background-color: red;
}

This CSS code selects all h1 elements when the mouse is over them:

h1:hover {
  color: blue;
}

Note:

Some pseudo-class selectors can also be used as attribute selectors. For instance, the :focus selector can be used to select elements with the focus attribute set.

Attribute Selectors

Attribute selectors allow us to select elements based on their attributes. For example, you can use an attribute selector to select all div elements with the class attribute set to my-class.

Example:

The following CSS code selects all div elements with the class attribute set to my-class:

div[class="my-class"] {
  background-color: green;
}

Pseudo-Element Selectors

Pseudo-element selectors allow us to select elements based on their content. For example, you can use a pseudo-element selector to select the content of a p element.

Example:

The following CSS code selects the content of all p elements:

p::before {
  content: "This is the content of the pseudo-element";
}

Combined Selectors

Combined selectors allow us to combine two or more selectors into a single expression. For example, you can use a combined selector to select all div elements with the class attribute set to my-class and are in focus.

Example:

The following CSS code selects all div elements with the class attribute set to my-class and are in focus:

div[class="my-class"]:focus {
  background-color: red;
}

Summary

In this lesson, we learned about advanced CSS selectors. We explored how to use pseudo-class selectors, attribute selectors, pseudo-element selectors, and combined selectors to target HTML elements in more specific ways.

In the next topic, we will learn about solving common CSS problems, such as syntax errors, style conflicts, and slow performance.