If you are not seeing changes that you have applied to your website, you may need to clear your browser cache and/or the CDN cache.
Browsers can often cache files independently of directives from the server.
$ver parameter in the
$ver will force the browser to download the file anew and is a good mechanism to bust not only the browser cache, but the CDN cache as well.
If the CDN is enabled, static assets will be cached. If you do not wish to bust the cache with parameters, you should be able to flush the CDN cache and achieve the same effect. (That said, it’s up to the browser to make the request in this case.)