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Originally Posted by cybmole
how would you use .css styling to do that ( add 2 pixels between paragraphs )
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p { margin-top: 2px }
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do you have to translate pixel measurements into pts or ems ?
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No, you can use "px" in CSS.
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I've developed a sense of what 1 em looks like, have not mastered points yet, as I read somewhere the ems scale better with text & thus are a preferred option for ebook layouts
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Points are an absolute unit of length, like millimeters or inches (1 pt = 1/72 in), as long as the renderer and the screen as properly set up. They don't change scale with anything, because a point is a point is a point, unless the renderer has some kind of magnification option.
Ems are font-dependent. If you change the font or the text size, an em changes too. Sometimes that's desirable, sometimes it's not.
Pixels are device-dependent. A pixel is a "point" in the screen (do not confuse with the above points), it's the minimal detail size for the screen. If you move to a screen with a different resolution, a pixel size will change. Sometimes that's desirable, sometimes it's not.