Hey, it goes both ways. Mark section headers with <h%d> tags instead of <font size="foo"> or <div style="foo">, but don't use <h%d> tags where all you want is

Hey, it goes both ways. Mark section headers with <h%d> tags instead of <font size="foo"> or <div style="foo">, but don't use <h%d> tags where all you want is formatting. In the same way, use <em> instead of <i> only when the italics are actually for emphasis, as in this sentence. In other cases, such as denoting internal thoughts in a story or something like that, don't use <em>.