Discussed at last PEWG meeting (31 Jan). There's a few more tiny language tweaks I'd love to make, just to make it clear which element's writing mode needs to be taken into consideration (tl;dr: the element where the touch-action is defined, and not any of the child elements inside it). setting back to draft until I sorted that.

Removing needs-wpt for now, since this isn't even in the spec. We definitely should add a wpt at the same time when landing this

discussed in today's PEWG meeting. want to include a graph/chart

need to also clarify explicitly what happens if you have touch-action defined on an element, and then a child element defines a different writing mode/direction (in short, only the one on the element that defined touch-action counts)