The \[DirectedEdge] character doesn't appear when I save a notebook as HTML.
Here's the notebook, which saves itself to HTML:
Here's the HTML:
In the HTML, the \[DirectedEdge] is encoded as , which unicodelookup.com doesn't recognize , but which Mathematica does:
FromCharacterCode[62421] // CharacterName
(* DirectedEdge *)
I have also tried adding the option "CSS" -> "mma.css" to the Export command.


\[Wolf]character by linking to a WRI CSS filespecial-styles.cssand using the prettify JavaScript. – ConvexMartian Oct 23 '18 at 13:37