This morning I wanted to get my Mac to join the Hotel’s WiFi network, and after being shown the Join WiFi window, and after providing all the correct information, I was shown a button that did nothing when clicked. The reason was that clicking that button would show a JavaScript popup, and this is not allowed inside the Join dialog. Here’s how I fixed it.

Luckily, macOS has a way to load this WiFi Join window inside an actual browser. The URL works just fine in Safari, so point your browser to:

http://captive.apple.com/hotspot-detect.html

It’s now possible to fill the form and actually see the JavaScript popup (as long as the browser settings don’t explicitly prevent it).