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Are module loaders missing in the feature list for ES6?

For now, yes.

Modules are difficult to test (via regular means like `eval`) and the standard is still in the flux so we're trying to figure out the best way — https://github.com/kangax/compat-table/issues/316

Maybe it would be a good idea to add a note in the meantime. I was quite confused when the module stuff was gone. I assumed it was moved to ES7, but it didn't show up there either. I finally learned the truth after googling a bit and finding that issue. Would have been nice if the page would have told me that right away.

Is this the only noteworthy ES6 feature which isn't tested?

Pretty much the only feature, yes. We'll be adding it shortly, sorry for the confusion.

Would checking for `System.import()` help?

System.import was removed from ES entirely. The Loader spec was moved to WhatWG and is no longer called System.

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