Use a variable instead of a hardcoded number.
Shape outside tests with percentages
remove webkit internals from tests, it is not needed anymore
[css21] Reviweing edits to margin-collapse test cases
Merging PR #62: https://github.com/w3c/csswg-test/pull/62
Merging PR #62: https://github.com/w3c/csswg-test/pull/62