I am a windows user, want to build a safari extension I am a windows user, want to build a safari extension, But i want to first know is there any way to test my extension in windows ? what is the latest version of safari for windows that apple support and if i build the extension on this version is that will run correctly on the latest safari version ?
The latest version of Safari for Windows is 5.1.7.

Extensions are made with HTML, CSS and JavaScript, so depending on the exact functionality you want in your extension, it should work on all Safari versions that support extensions. Extensions were introduced in Safari 5.0.1.

For more information, see this page.