+
+> Directive syntax doesn't allow named arguments containing colons, so we would have to
+> add a different syntax for weird names. However, we already have that:
+>
+> \[[!meta name="flattr:id" content="4j6y0v"]]
+>
+> This was missing from the documentation, but I have now added it. This feature was
+> broken until 2015, but we now have an automated test to make sure it keeps working;
+> the test includes a check for `twitter:card` which is essentially equivalent to
+> what you're doing here. [[done]] --[[smcv]]