Re: [webcomponents] "Creating an element" needs to be more precise, for upgrades (#424)

This turned out to work really well. Closing for now until/unless someone gets back to me with more places in the platform that create elements.

- "Create an element": https://w3c.github.io/webcomponents/spec/custom/#dfn-create-element
- Use in cloning: https://w3c.github.io/webcomponents/spec/custom/#clone-modifications-to-dom
- Use in parsing: https://w3c.github.io/webcomponents/spec/custom/#parsing
- Use in createElement(NS): https://w3c.github.io/webcomponents/spec/custom/#extensions-to-document-interface-to-instantiate

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/424#issuecomment-193887501