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Editorial Team
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Asked: 2026-05-24T05:54:02+00:00

I find it odd that when we do element.tagName , all browsers (Chrome /

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I find it odd that when we do element.tagName, all browsers (Chrome / FF / IE / Safari / Opera) consistently return the tag name in uppercase.

Is there actually an official w3c statement that states that user-agents actually had to return the tag name in uppcase?

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  1. Editorial Team

    You’re looking for DOM Level-2:

    tagName of type DOMString, readonly
    The name of the element.
    […]
    Note that this is case-preserving in XML, as are all of the operations of the DOM. The HTML DOM returns the tagName of an HTML element in the canonical uppercase form, regardless of the case in the source HTML document.

    So e.tagName should always be upper case for HTML but the case will match the source document for XML.

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