Top "Shorthand" questions

What does "a" stand for in font: 0/0 a;

I was referring a video tutorial where the designer used font: 0/0 a; for image replacement, so I get that 0 is …

css font-size shorthand
Is there a good JS shorthand reference out there?

I'd like to incorporate whatever shorthand techniques there are in my regular coding habits and also be able to read …

javascript shorthand
Add item to an Array in Ruby, even if the variable does not exist

I have the following: foo ||= [] foo << "bar" And I am sure this can be done in one line, …

ruby arrays shorthand