Re: [w3ctag/design-reviews] HTML General Review: Custom Elements (#244)

> doesn't that increase the likelihood that at any time we want to introduce it for custom attributes later we will find it more difficult?

@chaals see annevk's comment about "custom global attributes" above -- where those would likely require a hyphen to avoid conflicting with known attributes (just like custom elements requires today). So, I don't think we need to worry about future conflicts with custom attributes. As noted above, new built-in attributes will need to be added with care. 

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