CSS [attribute=value] Selector

Style <a> elements with a target="_blank":

a[target="_blank"] {
background-color: yellow;
}

More "Try it Yourself" examples below.

Definition and Usage

The [attribute=value] selector is used to select elements with the specified attribute and value.

Version:	CSS2

The numbers in the table specifies the first browser version that fully supports the selector.

Selector
[attribute=value]	4.0	7.0	2.0	3.1	9.6

[attribute = value] {
css declarations;
} Demo

When an <input type="text"> gets focus, gradually change the width from 100px to 250px:

input[type="text"] {
  width: 100px;
  transition: ease-in-out, width .35s ease-in-out;
}

input[type="text"]:focus {
  width: 250px;
}