Here are some "physical" tag examples:

Here is a B tag example. It always results in bold text.

Here is a I tag example. It always results in italisized text.

Here is a TT tag example. It always results in monospaced text.

Here is a BIG tag example.It always results in "bigger" text than surrounding text.

Here is a SMALL tag example.It always results in "smaller" text than surrounding text.

Here is _{a SUB tag example.} It always results in subscripted text.

Here is ^{a SUP tag example.} It always results in superscripted text.