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[Dakusan]

Original post for Font size hack for Mac Web Browsers can be found at https://www.castledragmire.com/Posts/Font_size_hack_for_Mac_Web_Browsers.
Originally posted on: 08/05/13

Mac renders fonts differently than windows, which is a problem when trying to make cross-system compatible web pages. I've read in many places that using "em" instead of pixels fixes this problem, but sometimes using pixel based measurements is required for a project.

I found when testing a recent project's web page out on Apple's OSX that no matter what browser I used, the fonts were always 2px bigger than on windows, which threw off my layouts. So I used the simple JavaScript solution below (jQuery required). Note that this assumes all font sizes are in pixels. It might not hurt to add a check for that if you mix font size types.

$(document).ready(function() {
   if(/Macintosh/.test(navigator.userAgent))
      $.each(document.styleSheets, function(Indx, SS) {
         var rules=SS.cssRules || SS.rules;
         for(var i=0;i<rules.length;i++)
            if(rules[i].style && rules[i].style.fontSize!='')
               rules[i].style.fontSize=(parseInt(rules[i].style.fontSize, 10)-2)+'px';
});