0.27.0 broken in IE11 (Object doesn't support property or method 'fromCodePoint')

[oleksii-leonov]

Looks like 0.27.0 broken in IE11:

Tested on IE11 (ver. 11.447.14393.0, Windows 10 with latest updates inside Parallels VM).
Edge, Chrome and other browsers on same VM works fine.

IE 11 console output:

SCRIPT438: Object doesn't support property or method 'fromCodePoint'
glyph_source.js (75,19)

mapbox-gl-js version: 0.27.0

Steps to Trigger Behavior

1. Open https://www.mapbox.com/mapbox-gl-js/examples/ in IE11 (Win 10).

Expected Behavior

Map should loads successfully (or alert saying browser doesn't support Mapbox GL).

Actual Behavior

Map doesn't load (and no "doesn't support Mapbox GL" alert).

[oleksii-leonov]

String.fromCodePoint() not supported by IE at all.
Also, it's not supported by Safari 9.

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint

Same problem with String.codePointAt().

With next 2 small polyfills map start working fine in IE11:
https://github.com/mathiasbynens/String.fromCodePoint
https://github.com/mathiasbynens/String.prototype.codePointAt

[mourner]

Good catch! We should get 0.27.1 out with a fix. cc @lucaswoj @1ec5

[jfirebaugh]

Unfortunately, we won't be able to use those polyfills directly: mathiasbynens/String.fromCodePoint#4.

[1ec5]

We don’t actually need String.fromCodePoint(), do we? String.fromCharCode() is sufficient for the Basic Multilingual Plane, and we don’t support rendering anything in the astral planes (mapbox/DEPRECATED-mapbox-gl#29).