Remove tagName testing and prefixing completely #8
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Custom element names require only to include at least one hyphen ([a bit more strict of course](https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name)) to produce valid HTML5 code. Thus it's unexpected and undesirable to prefix them with `data-` (which only meant to be used with attribute names).
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Custom element names require only to include at least one hyphen (a bit more strict of course) to produce valid HTML5 code. Thus it's unexpected and undesirable to prefix them with
data-(which is meant to be used with attribute names only).