Show a special message if the map isn’t supported in the browser.

[jimthoburn]

Let’s look for a way to detect if the map is supported in a user’s browser– and if it isn’t–show a message to the use to let them know, and recommend other options.

[jimthoburn]

@hanhanhan completed this one at last Tuesday’s hack night. She also discovered that MapBox has built-in detection for WebGL, via mapboxgl.supported().

Thanks, Hannah!

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