valid name of custom element
https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
name must match the PotentialCustomElementName production name must not be any of the following: <annotation-xml> <color-profile> <font-face> <font-face-src> <font-face-uri> <font-face-format> <font-face-name> <missing-glyph>
<annotation-xml>
<color-profile>
<font-face>
<font-face-src>
<font-face-uri>
<font-face-format>
<font-face-name>
<missing-glyph>
ASCII-case-insensitively. Originally, it is not possible to define a name including ASCII upper alphas in the custom element, but it is not treated as illegal by the HTML parser.
Optional
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valid name of custom element
See
https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
ASCII-case-insensitively. Originally, it is not possible to define a name including ASCII upper alphas in the custom element, but it is not treated as illegal by the HTML parser.