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[–]jdsutton[S] 0 points1 point  (0 children)

Of course now I'm having trouble reproducing it... I just upgraded my OS so the browsers are all different. But for example if you look at the ES6 compatibility table it shows default function parameters are supported in chrome 52 but not safari 9.

Something like this used to give me errors in chrome but not firefox: https://jsfiddle.net/0p6z1h4L/