Because FF's default font is, and the default browser settings ignore the font definition in CSS. Therefore, if you do not specify the font of the FF in CSS, the styles of the two browsers will definitely be different [the premise is that you have not changed the default settings of the FF browser, so that it can be defined with the CSS font].
Other summary:
1. P labels in IE and FF are not only different from the default values of margin and padding, but also have different line-height interpretations. Try to set line-height to actual pixels.
2. copy the static html page in Dreamweaver. when you use the ASPX page, you must pay attention to the encoding format, which may make the original page big variation (I use it. NET development, it is made into aspx first, and then writes the page with DW ).
3.set the CSS font to 14px/12em. The following 12em is line-height.