Introduction to CSS Selectors
Hello dear friend! Today we want to talk about different types of CSS selectors. Selectors are tools that help us apply different styles to HTML elements automatically. In simple terms, selectors specify which HTML elements a particular CSS code applies to. For example, if we want to change the text color of a specific tag, we use a selector to identify that tag.
CSS selectors are very diverse, and each has its specific application. Here, we will become familiar with general and specific selectors, classes, and IDs. Additionally, we will review other selectors like the descendant selector, sibling selector, and group selector. Each of these selectors has unique features and specific applications that are helpful in designing web pages.
One interesting aspect of selectors is that you can combine them to create more complex styles. For instance, you might want to change the background color of specific elements by using combinations of types, classes, IDs, descendant, and sibling selectors. This kind of specificity can help you achieve greater control over the styles applied to your web page.
For this reason, understanding the various CSS selectors is an essential part of web design knowledge. Now, let's briefly look at some examples of widely used CSS selectors and how to use them!
Examples of CSS Selectors
/* Type selector */
h1 {
color: blue;
}
/* Class selector */
.button {
background-color: green;
}
/* ID selector */
#unique {
font-size: 16px;
}
/* Descendant selector */
ul > li {
list-style-type: none;
}
/* Sibling selector */
h2 ~ p {
color: red;
}
/* Group selector */
h1, h2, h3 {
margin: 0;
}
Code Explanation
/* Type selector */
This selector applies to all h1 elements on the page, changing their color to blue./* Class selector */
This selector applies to all elements with the button class, changing their background color to green./* ID selector */
This selector applies to the element with the unique identifier unique, setting its font size to 16 pixels./* Descendant selector */
This selector applies to all li elements that are direct children of a ul, removing their default bullet points./* Sibling selector */
This selector applies to all p elements that are siblings of an h2, changing their color to red./* Group selector */
This selector applies a shared style to h1, h2, and h3, setting their margins to zero.