XHTML Basics - Part 6 Introduction Consider the following paragraph element: <p>In mathematics the < symbol is often used.</p> Note that you have the Less Than sign < inside the content of the paragraph. This less than sign is the open angle bracket. The open angle bracket begins a tag in your text editor. The browser uses this rule to know the beginning of the tag. If we have the < sign in the content of the paragraph element, the browser might consider it as the beginning of a tag. As you can... Sign in to see full entry.