[spamis]

I exported a book to epub from inDesign with a handful of fonts. I'm not sure I need embedded fonts so I eliminated all of the @font-face css and now all styles are simply set to font-family: serif or font-family: sans-serif and it seems to work. When I open the book in iBooks or Kindle every font face inherits the font selected by the reader and ignores the serif/sans-serif distinction but it acted this way before I eliminated the @font-face css. Here are some basic questions. (I am editing with calibre.)
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1. If the device defaults to the font selected by the reader (serif or sans-serif) regardless of the specified font-family in the css rule, do I even need to include a font-family for any of the css rules?
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2. I don't want to embed fonts but if I do specify font families used by a device (Georgia and Helvetica for instance) should the device honor the rule? In other words, if the css for chapter and subchapter headings is san-serif and the remainder of the text is serif, will they display that way? I ask because before I removed the specific font families, all fonts faces defaulted to the one selected by the reader and, in most instances, ignored the serif and sans-serif distinction. I tested it in iBooks with one simple page of text with a sans-serif heading (Ariel) and serif (Georgia) text and it still ignored the serif/sans-serif distinction.