Because of the competing interests of compatibility and functionality, numerous design strategies have emerged.

Many software systems use a layered architecture where platform-dependent code is restricted to the upper- and lowermost layers.

Graceful degradation

Graceful degradation attempts to provide the same or similar functionality to all users and platforms, while diminishing that functionality to a least common denominator for more limited client browsers. For example, a user attempting to use a limited-feature browser

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