Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

@oleersoy I don't think so. `is` is supposed to [customize/extend built-in elements](https://www.w3.org/TR/custom-elements/#custom-elements-core-concepts), so you could use their parsing, accessibility features, etc. even before your element is upgraded. For example: `<input is="spaceship-coordinates">`, `<template is="enhanced-template">`.

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