Re: [webcomponents] ES5 consideration for custom elements (#423)

The spec doesn't imply either.  `super()` is basically a syntactic sugar of `Reflect.construct`.

> `Reflect.construct` will not be required in the future as a non-exotic object will be returned from the `HTMLElement` constructor

This is certainly not the case.  `HTMLElement` constructor will continue to return an exotic object for the foreseeable future.

> Is this implying that browsers do not currently have Reflect.construct, but in the future browsers could invoke the base constructor through either a call to super() or using Reflect.construct?

All browsers that do support custom elements will support `Reflect.construct`.

Perhaps the spec could be updated to also mention `Reflect.construct` for clarity.

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