Attributes provide additional information about an element or a tag, while also modifying them.

Most attributes have a value.
In this example, the value of "center" indicates that the content within the p element should be aligned to the center:

Attribute Measurements

As an example, we can modify the horizontal line so it has a width of 50 pixels. This can be done by using the width attribute:

An element's width can also be defined using percentages:

The Align Attribute

The align attribute is used to specify how the text is aligned. In the example below, we have a paragraph that is aligned to the center, and a line that is aligned to the right.