I wanted this as well. I ended up setting up something in my vimrc across all files, but before that I attempted this patch:

diff --git i/syntax/markdown.vim w/syntax/markdown.vim
index d8d34ea..d962f6c 100644
--- i/syntax/markdown.vim
+++ w/syntax/markdown.vim
@@ -85,6 +85,9 @@ syn region mkdLinkTitle matchgroup=mkdDelimiter start=+"+     end=+"+  contained
 syn region mkdLinkTitle matchgroup=mkdDelimiter start=+'+     end=+'+  contained
 syn region mkdLinkTitle matchgroup=mkdDelimiter start=+(+     end=+)+  contained
 
+" Highlight TODO in markdown files
+syn keyword mkdTodo     contained TODO FIXME XXX TBD
+
 "HTML headings
 syn region htmlH1       matchgroup=mkdHeading     start="^\s*#"                   end="$" contains=mkdLink,mkdInlineURL,@Spell
 syn region htmlH2       matchgroup=mkdHeading     start="^\s*##"                  end="$" contains=mkdLink,mkdInlineURL,@Spell
@@ -177,6 +180,7 @@ HtmlHiLink mkdLinkDef       mkdID
 HtmlHiLink mkdLinkDefTarget mkdURL
 HtmlHiLink mkdLinkTitle     htmlString
 HtmlHiLink mkdDelimiter     Delimiter
+HtmlHiLink mkdTodo          Todo
 
 let b:current_syntax = "mkd"

Which did not work. I'd love to know or how to get it to work, though.

Add todo highlighting in the html comments #369

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