upstream-zulip/tools/documentation.vnufilter

# Warnings that are probably less important.

Consider using the “h1” element as a top-level heading only — or else use the “headingoffset” attribute \(otherwise, all “h1” elements are treated as top-level headings by many screen readers and other tools\)\.
Document uses the Unicode Private Use Area\(s\), which should not be used in publicly exchanged documents\. \(Charmod C073\)
Section lacks heading\. Consider using “h2”-“h6” elements to add identifying headings to all sections, or else use a “div” element instead for any cases where no heading is needed\.

# Opinionated informational messages.

Trailing slash on void elements has no effect and interacts badly with unquoted attribute values\.