Re: [w3c/webcomponents] connectedCallback timing when the document parser creates custom elements (#551)

IIR you can test this page and it should work in IE9 too
https://webreflection.github.io/hyperHTML-Element/test/?es5

compatibility is probably for something not fully transposable but I don't remember what.

Feel free to file a PR for the attribution so I'm sure it's done properly/as you expect.

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