I’ve been using iconping for years and it rocks. Sadly it doesn’t cater to all my needs and I was eager to contribute back. After seeing there are some pull requests and issues waiting for years, I decided to fork and incorporate all pull requests including my own. You can download iconpong from here.
Bookmarklet to inject an external CSS file into any website
This bookmarklet provides an easy way to test css styles against a website without access to its server by creating a <link/>element in the <head> of the page. It also updates it with an cache-blocking parameter if already exists.