Add "modality" to single pointer definition with examples of single pointer interactions

[patrickhlauke]

Follow-up to https://github.com/w3c/wcag/pull/3536#issuecomment-2352336750 to potentially address concerns by @WilcoFiers @dbjorge

Tries to more clearly differentiate "input" as in the modality from the gestures/interactions that are the result of using a particular input modality

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[patrickhlauke]

to be clearer: a tap, a swipe, a path-based gesture is not a "single pointer". they are examples of gestures performed using a single pointer

[patrickhlauke]

just on the point about "mechanism" having a different meaning in WCAG - note we already have an SC (albeit at AAA) that uses "mechanism" in the exact way it's intended here - 2.5.6 Concurrent Input Mechanisms

Although in the longer prose for the SC, it switches to "input modalities" ... so, maybe "modality" here as well, rather than mechanism? would that help?

[patrickhlauke]

if, contrary to the original consensus position, we were to expand the informative note, maybe something like this could strike the correct balance:

<p class="note">In contrast to single pointer interactions – including clicks, taps, dragging motions, and single-finger swipe gestures  – multipoint interactions involve the use of two or more pointers at the same time – such as two finger interactions on a touchscreen, or the simultaneous use of a mouse and stylus.</p>

as this then gives dragging etc only as examples, so hopefully avoids the non-sequitur we saw in https://github.com/w3c/wcag/issues/394

[alastc]

I'd suggest this to reduce the sentence complexity:

single pointer

an input that only targets a single point on the page/screen at a time – such as a mouse, single finger on a touch screen, or stylus.

Single pointer interactions include clicks, taps, dragging motions, and single-finger swipe gestures. In contrast, multipoint interactions involve the use of two or more pointers at the same time, such as two finger interactions on a touchscreen, or the simultaneous use of a mouse and stylus.

[bruce-usab]

Reviewed and finalized on Sep 20 TF call. Returned to the Errata for CFC column.