Re: [w3c/touch-events] note about avoiding conditional "touch OR mouse/keyboard" event handling (#72)

> @@ -960,7 +960,26 @@ <h3 id="event-touchcancel">The <dfn class="event"><code>touchcancel</code></dfn>
>        </ol>           
>        </section>
>  
> -
> +      <section class="note">
> +      <p>Even if a user agent supports Touch Events, this does not necessarily mean that a touchscreen is the only input mechanism available to users. Particularly in the case of touch-enabled laptops, or traditional "touch only" devices (such as phones and tablets) with paired external input devices, users may use the touchscreen in conjunction with a trackpad, mouse or keyboard. For this reason, developers should avoid binding event listeners with "either touch or mouse/keyboard" conditional code, as this results in sites/application that become touch-exclusive, preventing users from being able to use any other input mechanism.</p>
> +<pre class="example"><code>
> +// conditional "touch OR mouse/keyboard" event binding

Nit: add a comment like "WARNING: Don't do this, many devices support both touch and mouse".

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