Are there any restrictions on what may be contained in a meta-tag content?
I have the following meta-tag defined:
<meta name="doctype" content="<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">"/>
Unfortunately, the w3 validator throws an error that doesn't make sence, because the content really is just a string:
"-" is not a member of a group specified for any attribute
Can anyone explain the issue, we need different information in a client-side jQuery script and until now always used different meta-tags.
Are there any restrictions on what may be contained in a meta-tag content?
It depends on the version of HTML.
Most versions are pretty relaxed about it. HTML 5 has pretty strict restrictions (albeit ones which include "and anything on this Wiki page" … which no validator that I'm aware of manages to stay up to date with).
"-" is not a member of a group specified for any attribute
That is because you can't include a raw " character in an attribute value delimited with " characters. You need to represent it as " (or a numerical character reference).