API key swapping is not working in these browsers

[rmglennon]

DOES NOT WORK:

Internet Explorer 11
console error

SCRIPT438: Object doesn't support property or method 'fetch'
apikeys.js (6,3)

Safari Version 9.0.2 (11601.3.9)

TypeError: window.fetch is not a function. (In 'window.fetch('/api/keys.json', { credentials: 'same-origin' })', 'window.fetch' is undefined)
(anonymous function)apikeys.js:5
(anonymous function)apikeys.js:25

Failed to load resource: the server responded with a status of 404 (Not Found)
https://dev.mapzen.com/documentation/mobility/js/jquery-1.10.2.min.map

Safari Version 8.0.8 (10600.8.9)

via @nvkelso

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TESTED AND WORKS

• Firefox 44 and 47 on Windows 10
• Edge 38 on Windows 10
• Chrome 58 on Mac

[rmglennon]

Official browser support policy: https://mapzen.com/common/styleguide/#Browser-support

• Safari 10 is higher is required