doubledee — 2011-05-26T23:31:59-04:00 — #1
Is the question mark below allowable...
content="Did your plans change? Learn about our Cancellation Policy.">
black_max — 2011-05-27T02:23:02-04:00 — #2
I can't find anything that says a question mark isn't legitimate.
stevie_d — 2011-05-27T07:10:38-04:00 — #3
No reason why not - any characters within the charset you've defined can be used, and character entities should be used for any others (including " if you need it).
system — 2011-05-27T13:14:22-04:00 — #4
META in HTML 4.01
content CDATA #REQUIRED -- associated information --
CDATA in HTML 4.01
CDATA is a sequence of characters from the document character set and may include character entities. User agents should interpret attribute values as follows:
Replace character entities with characters,
Ignore line feeds,
Replace each carriage return or tab with a single space.
CDATA is the same as normal content text in html -- so anything you can use on your content you can put into your CONTENT attribute.