Question

Is there any performance difference between:

p {
  margin:0px;
  padding:0px;
}

and omitting the final semicolon:

p {
  margin:0px;
  padding:0px
}

Thanks in advance!

Answer 1

No there is not, the browser doesn’t care about the trailing semicolon, even in IE6. The parser checks for it as a delimiter that’s it.

If anything, since the browser is basically performing tokenization not much more complex than .split(';'), the second may be faster in a probably not measurable way simply because of the lack of an extra null token. But…the difference would be infinitesimal, and you do not need to worry about it either way.