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Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically.
Specifically requires that the content, code, design that is being worked on is being seen WYSIWYG as it is created, live, in Real-Time. That is to say, that no additional or interim steps, actions, or refresh is needed by the user. The system is automatically without intervention reflecting the changes made/edited and representing them in Real-Time in the preview in a way that very closely (if not exactly) represents the final product in whatever form - whether in print, screen, web form, etc. (see WYSIWYG).