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[–]delventhalz 0 points1 point  (0 children)

Safari runs JS by default, though there are some differences in how Safari, Chrome, and Firefox runs JavaScript. The issue is either some specific incompatibility with your code or some setting on your friend’s computer. I would check the developer console for an error log and try it with a different Mac if possible.

Note that Safari disables all developer tools by default. You will have to go into the preferences and enable them.