Old HTML Math Symbols - Are They Still Available?

[ObsessiveMathsFreak]

Some of the old shorthand HTML codes for writing mathematical symbols don't seem to work any more.

[int] doesn't bring up an integrale symbol anymore.

Has the code changed or is this feature unavailable at present.

P.S.
Is there a list of the available codes that still work. like [pi]

 

[ObsessiveMathsFreak]

Trying all caps

[int] [INT]
[aa] [AA]
[tt] [TT]
[es] [ES]
[ep] [EP]