Finding the Simulator
You can test with the iOS Simulator that comes with Xcode. Navigate to the Xcode app in the Finder, right click and select "Show Package Contents":
Then navigate to Contents > Applications, and open the shortcut to "iPhone Simulator" (it may be called "iOS Simulator" depending on which version of Xcode you're running):
Viewing & Testing
When you're in the simulator, click open Safari, click on the URL bar, and you can paste the testing URL using ^⌘V (Edit > Paste Text), then hit enter.
You can test different devices and orientations using the Hardware menu:
Debugging
You can use Safari's inspector to debug web pages running in the simulator. Just open Safari (in OS X) alongside the simulator running Safari in iOS, and go to Develop > iPhone Simulator > [your device/tab]:
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brandondrew commentedFeb 6, 2016
The latest version of Xcode does not have the simulator there:
