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Adding a mode makes the interaction with it both modal and more complex.

Compatibility modes are confusing and user hostile, and two different methods of interaction increasing testing requirements.

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Increasing testing requirements on what? I meant adding it to the browser (or the window manager/X/whatever), which would not require a massive effort to test. The websites themselves already have to support (at least) three modes of interaction if they want to have all main browsers supported (mouse, touch, keyboard).

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