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Scripts allow HTML forms to process input as it is entered: to ensure that values conform to specified patterns, to check consistency between fields and to compute derived fields.
Scripts can also be used to simplify authoring of active documents. The behaviour of objects inserted into HTML documents can be tailored with scripts that respond to events generated by such objects. This enables authors to create compelling and powerful web content. This specification covers extensions to HTML needed for client-side scripting, but leaves out the architectural and application programming interface issues for how scripting engines are implemented and how they communicate with the document and other objects on the same page.