In the past I've disabled Location Services for a specific site in Safari for OS X, but would now like to enable it, for that site only. How do I do that. None of the instructions I've found describe the current user interface for Safari (e.g., there is no "Reset Safari" window in 9.1.2).
The following works for me in Safari 12.0.
Go to the specific site you want to change the setting for.
Now, from the Safari menu (next to the Apple menu), choose Settings for This Website.
A pop-over should appear, with a Location setting at the bottom.
Go to safari preferences (press ⌘+,) -> Click on privacy -> Then choose ask every day, and revisit the specific page tomorrow.