The touch-action property defines a number of tokens. Edge and Chrome also ship an additional pinch-zoom token (and I believe Firefox plans to as well /cc @staktrace). But it's not clear if this will ever make it into the W3C PointerEvents spec.

I think it's particularly important that we increase the visibility of this property (eg. document it on MDN for accessibility reasons. Many image carousels already use touch-action: pan-y when they probably should be using touch-action: pan-y pinch-zoom in order to avoid disabling zooming for vision impared users.

It'll be a little awkward to monkey patch it in, but is it OK if I submit a PR for this?
/cc @dtapuska @teddink @NavidZ @mustaqahmed