The following causes a fatal error in XML/XHTML, and will break any page interpreted as XML:
<!-- div class="block block--mod">...</div> -->
This is because the double dash is interpreted as a comment delimiter, when inside an SGML instruction (<! ... >).
While this problem occurs for any use of double dashes, it's regrettable when these are introduced as part of a system.
The following causes a fatal error in XML/XHTML, and will break any page interpreted as XML:
<!-- div class="block block--mod">...</div> -->This is because the double dash is interpreted as a comment delimiter, when inside an SGML instruction (
<! ... >).While this problem occurs for any use of double dashes, it's regrettable when these are introduced as part of a system.