The :before pseudo-element selector allows content to be generated before the specified element. The content property is used to specify the content which will be generated. In the following example, an image will be displayed before the start of each <p> element.
CSS Example:
p:before {content: url("../images/dots.gif");}
<p>An image should be generated before this text.</p>
<p>An image should be generated before this text.</p>
