How to force a browser to show the latest changes to a CSS file?

Question

I made some changes on a CSS file on a PHP site.

The changes do not show up in any browser I test it on until I hold down the CTRL key and click the brows

Answer 1

You can't.

If the new CSS file has the same name as the old the browser will use the cached file. This means that you've either got to:

1. use some form of `css_filename.css?version_number`
2. or, use another name for the new file
3. or, do as you're doing, and use ctrl+F5