clear on inline
run-in past out-of-flow
inline-block baseline
big line-heights and small floats (they should stack, not separate)

Things to test for linking stylesheets:
  <link media="screenball" rel="stylesheet" href="...">
  <link type="text/css" href="..."> <!-- no rel -->
  <link type="bogus-test/css-bogus" rel="stylesheet" href="...">