Per CSS WG feedback, the following text should be added to clarify the processing model for touch-action:
> When a user touches an element, the effect of that touch is determined by the 'touch-action' property and the default touch behaviors on the element and its ancestors. To determine the effect of a touch, find the nearest ancestor (starting from the element itself) that either has a default touch behavior or that has "touch-action: none". If that element has “touch-action: none”, do nothing. Otherwise, allow the element to start considering the touch for the purposes of executing its default touch behavior.
Change made as requested.