Re: [w3c/webcomponents] Polymer encouraged incorrect document.createElement() usage (#544)

WebKit does not agree with customized built-in elements, but they are included in the standard since we have multiple vendors interested in implementing. If it turns out that for some reason that doesn't happen, they will be removed.

[Nothing in spec land is ever final, however.](https://wiki.whatwg.org/wiki/FAQ#What_does_.22Living_Standard.22_mean.3F) It's a judgment call when you want to start implementing something. All major web browsers already have.

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