Does "font-size: 100%;" have some effect?

Hi there:

Does the instruction font-size: 100%; have some effect, or it's just setting the default font size; as it is already is?

Thanks in advance,

Rafael

Text displays perfect in Windows & Mac OS, wrong size on iPhone

The CSS:

.resume .details {
	clear: both;
	text-align: justify;
	margin-bottom: 10px;
	display: block;
	font-size: 12px;
	font-family: museo-sans,sans-serif;
	font-weight:500;
	padding-left:28px;
	line-height: 120%;
}
 
.resume .title {
	float:left; 
	clear:left; 
	font-size: 14px;
	font-family: museo-sans,sans-serif;
	font-weight:500;
	padding-left:16px;
	margin-bottom:4px
}

Font size not consistent in IE8 and Firefox 4

I followed the W3C Schools recommendation on font-size (default font-size in percent for the body element and em size for h1,h2 etc and p). Gives the same text size in all browsers and allows all browsers to resize text. However I cannot achieve this in Firefox, IE8 it works OK. Firefox has a smaller font-size when viewed.
Relevant parts of the css sheet:

html, body, div, span, h1, h2, h3, h4, h5, h6, p, blockquote, a, acronym, cite, em, img, strong, dl, dt, dd, ol, ul, li, form, label, table, caption, tr, th, td {
background-color : white;
color : black;
font-size : 100%;

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