If you are just doing a single page its not that different, but if you are building a web app and trying to tweak the CSS inside a modal or something that isn't

If you are just doing a single page its not that different, but if you are building a web app and trying to tweak the CSS inside a modal or something that isn't there on page load it makes a difference. Instead of refresh -> click button to show modal again, it lets you see the changes as you make them.