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In general topological spaces, there is no notion of nearness or distance. This definition is equivalent to the same statement with neighborhoods restricted to open neighborhoods and can be restated in several ways by using preimages rather than images. A function is continuous if and only if it is both right-continuous and left-continuous. Discontinuous functions […]

They are really intended to force UA’s to refresh volatile information, not keep UA’s from being retaining information. If the specs were always crystal clear, there wouldn’t be much point for sites like StackOverflow. This is a good example of why you need to go beyond the specs. Somehow caching is causing a huge issue