[Bug 18863] [Custom]: Consider only restricting naming to contain a dash

https://www.w3.org/Bugs/Public/show_bug.cgi?id=18863

--- Comment #2 from Daniel Buchner <danieljb2@gmail.com> ---
I would go with 'x-' for the following reasons:

1. Consistency in View Source browsing is important for discover/hack-ability.
2. Is there any chance HTML itself will ever have a native tag that contains a
dash causing an issue in the future?
3. What is the benefit of enforcing only the presence of a dash? Why should we
make the tokenizer/parse code more complex if it yields no significant
benefits?

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