short text but longer really

is there way 2 do diz?

[mecjfl]

i can only have room for "cat" not "category" but i want an alt text saying "category" like if it was image can you do this with pure text?

then i could have like "cat." printed but it would really say "category" do you get what I meaned?

[whoisgregg]

For abbreviations:
<abbr title="Category">Cat.</abbr>

For acronyms:
<acronym title="Federal Bureau of Investigation">F.B.I.</acronym >