What should i keep for body, {font-size: 100.01%; } or { font-size: 100%; }?
what is {font-size: 100.01%; }? and is it really good to mention font-size in html{} even
If I'm using body {font-size: 62.5%;}
Edit : 3 May 2010
Today i found info about 100.01% at here - http://www.communitymx.com/content/article.cfm?cid=FAF76&print=true
This odd 100.01% value for the font size compensates for several browser bugs. First, setting a default body font size in percent (instead of em) eliminates an IE/Win problem with growing or shrinking fonts out of proportion if they are later set in ems in other elements. Additionally, some versions of Opera will draw a default font-size of 100% too small compared to other browsers. Safari, on the other hand, has a problem with a font-size of 101%. The current "best" suggestion is to use the 100.01% value for this property.
Is it good to keep body { font-size:100.01%} in place of {font-size:100%}
The declaration body (or html) { font-size: 100.01% } compensates rounding errors, in particular in older versions of Opera and Safari. Both would otherwise display fonts that are too small.
A relative font-size (%, em) is always interpreted relative to the font size of the parent element. So it's not a bad idea to implement kind of a initial reset in the top element, which you can achieve with body {font-size: 100%}.
Never seen 100.01% before, but it seems like some sort of browser hack that will force some browsers to ignore or calculate size correct if you use this "fix".
I wouldn't use it myself though, as errors tends to be fixed and there are often more nice ways of dealing with the same option.
html { font-size: 100.01%; }
100.01%, not a hack or a kludge, has been around for many years. Google "100.01%" and read up. It is as valid as 100% and does cover some territory 100% doesn't.
An initial font-size should always be declared. Set a base font-size on an outer container -- either <html> or <body> -- for it is from that container which all relative and inherited font-size values will derive. Using 100% or 100.01% makes the starting font-size equal to the user's browser preference.
Setting that base font-size to the user's browser preference gives your visitors maximum readability. Read that again, please, about the USER's preference. Your visitor will have set their browser font-size for their own best legibility and reading comfort. Your design, magnificent and fragile though it may be, is only a second-string player. Content is king, assuming you have some. But if that content is un-readably tiny, you lose. The visitor surfs on. Your design, then, has failed your needs and your expectations. Therefore, the design really wasn't all that great, was it?
来源：https://stackoverflow.com/questions/2703056/body-font-size-100-01-vs-body-font-size-100