CSS syntax and selectors

CSS syntax is the set of rules that govern how CSS code is written. It is important to understand CSS syntax in order to write CSS code that is both valid and readable.

CSS selectors are used to select HTML elements to apply CSS styles to. There are many different types of CSS selectors, each of which selects elements in a different way.

Here is a basic overview of CSS syntax and selectors:

• CSS rules are made up of selectors and declarations.
• Selectors are used to select HTML elements.
• Declarations are used to set CSS properties for the selected elements.
• Properties control the appearance of the selected elements.
• Values are the specific values that are assigned to properties.

Here is an example of a CSS rule:

h1 {

  color: red;

}

This rule selects all h1 elements and sets the color property to red

Here is a more complex example of a CSS rule:

p {

  font-family: sans-serif;

  font-size: 16px;

  line-height: 1.5;

}

This rule selects all p elements and sets the font-family property to sans-serif, the font-size property to 16px, and the line-height property to 1.5.

There are many different types of CSS selectors, each of which selects elements in a different way. Here are some of the most common types of CSS selectors:

• Type selectors select elements based on their type. For example, the h1 selector selects all h1 elements.
• Class selectors select elements that have a specific class. For example, the .my-class selector selects all elements that have the my-class class.
• ID selectors select elements that have a specific ID. For example, the #my-id selector selects the element with the ID my-id.
• Attribute selectors select elements that have a specific attribute. For example, the [href] selector selects all elements that have an href attribute.
• Pseudo-class selectors select elements based on their state or condition. For example, the :hover pseudo-class selects elements when the user hovers over them.
• Pseudo-element selectors select parts of elements. For example, the ::after pseudo-element selector selects the content that comes after an element.