Specifically, I’m looking for browser versions that first gave basic support to HTML elements, in IE, Firefox, Opera, Chrome, and Safari.
The Mozilla Developer Network is a good resource; however, basic browser support of many elements in this resource are listed as ‘yes’ instead of the first known compatible browser versions. Example: The bottom ‘Browser compatibility’ table of the summary for the (Bold) element.
Other resources conflict on first supporting browser versions for various elements, and, don’t list references either. Example: Blooberry.com, an ancient (!) and popular resource, lists the B element as being first supported by IE in version 1. Aptana.com, however, lists IE 2.0 as its first version supporting .