ref
Atomically increments the reference count of @user_style_sheet by one.
This function is MT-safe and may be called from any thread.
Return
The passed #WebKitUserStyleSheet
Since
2.6
Atomically increments the reference count of @user_style_sheet by one.
This function is MT-safe and may be called from any thread.
The passed #WebKitUserStyleSheet
2.6