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I’ve been seeing this instruction as the very first line of numerous CSS files that have been turned over to me:
@charset "UTF-8";
What does it do, and is this at-rule necessary?
Also, if I include this meta tag in my “head” element, would that eliminate the need to have it also present within my CSS files?
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
It tells the browser to read the css file as UTF-8. This is handy if your CSS contains unicode characters and not only ASCII.
Using it in the meta tag is fine, but only for pages that include that meta tag.
Read about the rules for character set resolution of CSS files at the w3c spec for CSS 2.