Normally UTF should be uppercased as it's an abbreviation.
However, attributes in HTML are normally lowercased.
So, should it be: <meta charset="UTF-8"/> or <meta charset="utf-8"/>?
I know both work.
Thank you.
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2 Answers
The value for charset is case-insensitive.
From spec.whatwg.org
The charset attribute specifies the character encoding used by the document. This is a character encoding declaration. If the attribute is present, its value must be an ASCII case-insensitive match for the string "utf-8".
Link to full document: https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-charset
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5My vote is for lowercase though. Sort of like they've moved to with sql. I think it'll be mostly lowercase preferred in the long-term future. Commented Jun 4, 2012 at 21:59
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Awesome, thanks Ilanco. Do you happen to have the link to that quote?– FranciscCommented Jun 4, 2012 at 22:00
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3blog.codingoutloud.com/2009/04/08/… Seems to be of a guy that goes pretty deep into the topic. Commented Jun 4, 2012 at 22:01
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1Ah, I had read that, but it's old and mostly oriented towards XML. Plus he recommends uppercase.– FranciscCommented Jun 4, 2012 at 22:03
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2This may not be relevant, but the general trend in everything (even outside of tech) these days has been to lowercase. HTML tags for example. Even in schools they prefer lowercase now.– rvighneCommented Jan 24, 2014 at 23:36
As per the W3C:
A case-insensitive match for any character set name for which the IANA [Character Sets] registry has a Name or Alias field labeled as “preferred MIME name”; or, if none of the Alias fields are so labeled, a case-insensitive match for a Name field in the registry.
The specification does not specifically provide for a canonical case. Previously, I would have suggested you just use UTF-8 (from the registry), however the world is moving to lowercase and I now prefer utf-8 as it aligns better with all your other HTML.
answered Sep 30, 2014 at 12:01
