Doubled margins between block elements

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NOTE: This is an issue with code that has not yet been released.

In many instances, browsers render only the largest of two margins between block elements. (For instance between h[1-6] or p elements (as reported in #71))

[Sub6Resources]

Official documentation for what we're trying to achieve: https://www.w3.org/TR/CSS21/box.html#collapsing-margins