a) Higher resolution displays and style sheets that do not scale... b) changes in browser compatibility may require you to adjust your html declaration, doctype

a) Higher resolution displays and style sheets that do not scale... b) changes in browser compatibility may require you to adjust your html declaration, doctype and meta tags as well. I've been adjusting my web pages changing the body font size from a fixed point size to an em value, most browsers do some scaling when that is the case, also I do a minor size increase as well. Now most pages get a desktop font-size of 1.2em with mobile width adjusting to 1em, and print with .7 em..