Users can do that, and it is [still!] a first class (ie. not hidden in about:config, but available in preferences) configuration option in Firefox.
Part of a web design job should be testing your creation under different user selectable options. Like zoom, font selection, screens of various quality, etc. But most designers still treat web browsers, like it's a piece of paper they're in complete control over.
Part of a web design job should be testing your creation under different user selectable options. Like zoom, font selection, screens of various quality, etc. But most designers still treat web browsers, like it's a piece of paper they're in complete control over.