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Improvement
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Resolution: Fixed
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Blocker
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3.8
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MOODLE_38_STABLE
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MOODLE_38_STABLE
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MDL-67137-master -
So it turns out that babel-polyfill (and core-js/stable which replace it) do not include polyfills for DOM things.
Some DOM things, like `Element.closest` do not work in IE and so we need to add our own polyfill.
Yay.
MDN provide polyfills for us, though they don't give any indiciation as to the license.