Proper invocation of {:aside}

rfc9204.md

@@ -1200,13 +1200,12 @@ This is possible even over the Transport Layer Security Protocol
 while TLS and QUIC provide confidentiality protection for content, they only
 provide a limited amount of protection for the length of that content.
 
-<aside><t>
-Note: Padding schemes only provide limited protection against an attacker with
+{:aside}
+> Note: Padding schemes only provide limited protection against an attacker with
 these capabilities, potentially only forcing an increased number of guesses to
 learn the length associated with a given guess. Padding schemes also work
 directly against compression by increasing the number of bits that are
 transmitted.
-</t></aside>
 
 Attacks like CRIME ({{CRIME}}) demonstrated the existence of these general
 attacker capabilities. The specific attack exploited the fact that DEFLATE