In order to start off on the right foot, you must first understand the notion of beacon, which is the basis of everything we are going to do next. To say that XHTML is a markup language is to say that the structure of an XHTML document is created using markup.

These tags delimit a fraction of code in an XHTML page.

Attribute of a tag
Apart from the name of the tag, an attribute can be specified in a tag. A tag can have none, one or more attributes. Attributes are assigned a value that allows you to give a specific behavior to the element contained in a tag or to give characteristics to the tag itself. Example attribute:

<img src="image.jpg" />