<meta name="flattr:id="4j6y0v"" content="" />
I tried [a number of possibilities](https://feeding.cloud.geek.nz/recentchanges/) and they all failed to produce the correct output.
+
+> 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"]]
+>
+> Please try that. --[[smcv]]