Google is about to begin transitioning their users away from Flash, unless they explicitly enable it on a site-by-site basis. This is a step beyond click-to-activate, which refuses to activate the plug-in until the user permits it, that will not even acknowledge the plug-in’s existence unless the user requests it. The difference is that this tells sites to treat the browser as not having Flash, which, for PC Perspective as an example, should load our HTML5 article carousel instead of presenting a click-to-activate Flash one that has an expanding oval transition animation.
Because changes like these could have side-effects, Google is dipping their toe before jumping in. About 1% of users on the current Chrome 55 (and ~50% of Chrome 56 pre-release users) will have this change flipped on any day now, which contains the outrage if it breaks something popular or, otherwise, causes user grief. If it all goes well, though, it will be enabled for everyone when Chrome 56 arrives for the general public in February.