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  • CSS Selectors

Topics

  • CSS Introduction
  • CSS Syntax and CSS Comments
  • CSS Selectors
  • How to add CSS to a Webpage
  • CSS Color Basics
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  • CSS Border Properties
  • CSS Margin and Padding Properties
  • CSS Height and Width properties
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  • CSS Outline Properties
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  • CSS Text
  • How To Add Icons
  • CSS Links
  • CSS List-Style
  • CSS Tables
  • CSS Display Property
  • CSS Position Property
  • CSS Overflow Property
  • CSS max-width Property
  • CSS Float and Clear Properties
  • CSS Alignment
  • CSS inline-block
  • CSS Combinators
  • CSS Pseudo Classes
  • CSS Pseudo Elements
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  • CSS Dropdowns
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  • CSS Image Sprites
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CSS Selectors

CSS selectors are used to select the HTML elements you want to style. CSS selectors select HTML elements on the basis of its id, class, type, attribute etc.

Following are different types of selectors:

  • Simple selectors (find elements based on name, id, class)
  • Combinator selectors (find elements based on a specific relationship between them)
  • Pseudo-class selectors (find elements based on a certain state)
  • Pseudo-elements selectors (find and style a part of an element)
  • Attribute selectors (find elements based on an attribute or attribute value)
  • Attribute selectors (find elements based on an attribute or attribute value)
Now, discuss the most basic selectors.

CSS element Selector:

The element selector selects HTML elements by element name.

Example :

Here, all <p> elements on the page will be center-aligned, font-size will be 20px and blue text color:
p {

text-align: center;

font-size:20px;

color:blue;

}
Try it

CSS id Selector:

The id selector selects the id attribute of an HTML element to select a perticular element. An id is always unique within the page so it is used to select one, unique element.
It is written with the hash(#) character, followed by the id of the element.

Example:

The CSS properties below will be applied to the HTML element with id=”test”:
#test {

background-color: red;

text-align: center;

}
Try it

CSS class Selector:

By using class attribute, the class selector selects HTML elements. To select elements with a perticular class, write a period (.) character, followed by the class name.

Example:

Here, all HTML elements with class=”center” will be red background-color and center-aligned:
.center {

background-color: red;

text-align: center;

}
Try it
You also specify that only one specific HTML element should be affected then you should use the element name with class selector.

Example:

In this example only elements with class=”center” will be center-aligned and background-color will be red:
p.center {

background-color: red;

text-align: center;

}
Try it

CSS Universal Selector:

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

Example:

Here, the CSS rule below will affect every HTML element on the page:
* {

background-color: red;

text-align: center;

}
Try it

CSS Grouping Selector:

The grouping selector is used to selects all the HTML elements with the same style definitions.
To minimize the code, grouping selector is useful. Each selector in grouping are seperated by commas.
The CSS code without group selector is as follow:

Example:

h1 {
background-color: red;
text-align: center;
}

h3 {

background-color: red;
text-align: center;
}

p {

background-color: red;
text-align: center;
}
It will be better to group the selectors, and minimize the code.

Example:

In this example we have grouped the selectors from above code.
h1, h3, p {

background-color: red;

text-align: center;

}
Try it

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