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

`HTMLElement.call(this)` would not work but `Reflect.construct(HTMLElement, [], FlagIcon)` would.

All browsers that support custom elements v1 API would support `Reflect.construct`.  The contrapositive of that statement will be that all browsers that don't support `Reflect.construct` would not support custom elements v1.

So, you can write a wrapper around it which calls `Reflect.construct` to use native support for custom elements on "modern" browsers, and use custom elements polyfill (e.g. setting `__proto__`) on others.

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