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ASP.NET for Web Designers by Peter Ladka

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Multi-Browser Support and Validation

This is an area that could afford some investigation on how ASP.NET delivers different code to different browsers depending on their capabilities. As I’ve said, ASP.NET is pretty smart about handling browser capabilities and rendering code that different browsers can handle.

By default, ASP.NET lumps browsers together as uplevel and downlevel browsers.

  • Uplevel. Internet Explorer 4.x and up

  • Downlevel. Basically everything else, including Netscape 6.x

These aren’t hard and fast rules for all Web server controls, but where validators are concerned, the uplevel browsers deliver both JavaScript client-side validation and server-side validation, and downlevel browsers are restricted to server-side validation. ...

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