Could you use the browser to control the font size?
Being able to enlarge text only is valuable to many users because it provides more control and flexibility in viewing the page. People with vision or other impairments use different ways to control font size on a web page. Some go into Internet Options to do this. Others use special toolbars. With ZoomText and other screen magnifiers, it is done within the software. Sometimes users can control the font size by enlarging the whole page, but aren’t able to control only the font size. This often is because style sheets use absolute values. People using screen magnifiers may more easily navigate the content of a web page with many graphics if they can enlarge only the text. Anyone who needs help in focusing on the text might benefit from enlarging the text only.