What exactly changes in the css rendering, when desktop browsers zoom in or out on a website?

Question

In what way is the design scaled up or down? I\'m trying to figure out what exactly happens at the CSS level, and what the consequences are for different sizing methods (

Answer 1

If you are referring to what happens within the browser when you zoom, it depends on what browser you are using, and on what device. I believe the type of measurement unit you use in your CSS can also be a factor (%, em, and px). But typically, say the CSS applied to fonts, that gets rendered again when you zoom. Same with background property values. But in many browsers this re-rendering happens so fast you shouldn't even notice it, unless there is some performance issue that is slowing the browser down (which could be code or system related).