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T his chapter discusses design patterns that create an alert . An alert points out important information to the reader by separating it from the content. There are two basic types of alerts: dynamic and static . The first three design patterns in this chapter are dynamic alerts, which dynamically display information as a user interacts with the document. The remaining alerts in this chapter are static alerts, which are always displayed in a document. The Alert design pattern is an HTML pattern, which is basically a heading followed by the alert’s message. The design patterns following Alert combine it with other design patterns, demonstrating how you can combine existing design patterns to create new design patterns.