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In HTML attribute name=value pairs, what are the characters allowed for the 'name' portion? ..... Looking at some common attributes it appears that only letters (a-z and A-Z) are used, but what other chars could be allowed as well?... maybe digits (0-9), hyphens (-), and periods (.) ... is there any spec for this?
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Tags contain a tag name , giving the element's name. HTML elements all have names that only use characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), U+0061 LATIN SMALL LETTER A to U+007A LATIN SMALL LETTER Z, and U+0041 LATIN CAPITAL LETTER A to U+005A LATIN CAPITAL LETTER Z.
The name attribute specifies a name for an HTML element. This name attribute can be used to reference the element in a JavaScript. For a <form> element, the name attribute is used as a reference when the data is submitted. For an <iframe> element, the name attribute can be used to target a form submission.
HTML attributes are generally classified as required attributes, optional attributes, standard attributes, and event attributes: Usually the required and optional attributes modify specific HTML elements.
It depends what you mean by "allowed". Each tag has a fixed list of attribute names which are valid, and in html they are case insensitive. In one important sense, only these characters in the correct sequence are "allowed".
Another way of looking at it, is what characters will browsers treat as a valid attribute name. The best advice here comes from the parser spec of HTML 5, which can be found here: https://html.spec.whatwg.org/multipage/syntax.html#attributes-2
It says that all characters except tab, line feed, form feed, space, solidus, greater than sign, quotation mark, apostrophe and equals sign will be treated as part of the attribute name. Personally, I wouldn't attempt pushing the edge cases of this though.
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