Currently, the LibTF Javascript API makes extensive use of ES6 class notation. As such, games that use the library will only run on non-ancient browsers. If you are still using IE9 or Mosaic or something, you really ought to upgrade. ;) Eventually I'll add something to the compile chain to output minified ES5 and use that for stable releases, but as of now that's the situation.
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The LibTF API is contained in the toplevel "LibTF" object, containing the following APIs and Classes: