Currently AMP supports hide on all elements as a standard action.

I like to extend the standard actions to include show and toggle for all elements as well. Showing/hiding elements is already somewhat supported by using amp-accordion or CSS tricks such as using :focused pseudo-selector. amp-bind would be supporting this as well, therefore I do not see any fundamental issue with extending the standard actions to include show and toggle.

@ericlindley-g @dvoytenko @cramforce