CSS Simple Selector

Summary

• The id selector uses the id attribute of an HTML element to select a specific element.
• The class selector selects HTML elements with a specific class attribute.
• The universal selector (*) selects all HTML elements on the page.
• The element selector selects HTML elements based on the element name.
• The grouping selector selects all the HTML elements with the same style definitions.

All CSS Simple Selectors

Precedence

id > class > tag / element

The CSS id Selector

• The id selector uses the id attribute of an HTML element to select a specific element.
• The id of an element is unique within a page, so the id selector is used to select one unique element!
• To select an element with a specific id, write a hash (#) character, followed by the id of the element.

Note

An id name cannot start with a number!

Example

#para1 {
  text-align: center;
  color: red;
}

The CSS class Selector

• The class selector selects HTML elements with a specific class attribute.
• To select elements with a specific class, write a period (.) character, followed by the class name.

Example

.center {
  text-align: center;
  color: red;
}

The CSS Universal Selector

• The universal selector (*) selects all HTML elements on the page.

Example

* {
  text-align: center;
  color: blue;
}

The CSS element Selector

• The element selector selects HTML elements based on the element name.

Example

p {
  text-align: center;
  color: red;
}

The CSS Grouping Selector

• The grouping selector selects all the HTML elements with the same style definitions.

Example

h1, h2, p {
  text-align: center;
  color: red;
}