I've had a larger phone because I got fed up with squinting at my screen, but because of that I also have the OS level font bumped to 115% (and I know Jule, my wife, has it bumped to 125%). This meta tag will use the system font size to adjust the font. Importantly, Josh also points out that the default font size shouldn't be touched: Source: www.joshtumath.uk#heading-tip-1:-don't-override-the-initial-font-size /By Josh Tumath, via Jeremy Keith