Input is constantly evolving and expanding beyond traditional keyboard and mouse. The document discusses 7 principles for adapting web design to different inputs:
1. Design for the largest target by default.
2. Design for modes of interaction instead of specific inputs.
3. Make designs accessible to all inputs.
4. Support multiple concurrent inputs.
5. Abstract baseline inputs like tap, click, and point.
6. Progressively enhance with new inputs like gestures and sensors.
7. Include different inputs in testing plans.
The key message is that input cannot be detected, is a continuum, and is always changing. Web design needs to be adaptable and not assume certain inputs based on device properties.
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