.md.html is a file extension for Markdeep (https://casual-effects.com/markdeep/), a Javascript-based way of displaying Markdown files in web browsers. Unfortunately, Kate doesn't realize that these files are both Markdown *and* HTML; it only highlights the HTML tags.
Git commit 0198ada8fcb79fd059358a23747d2d65ed5bfa09 by Christoph Cullmann. Committed on 19/12/2023 at 19:48. Pushed by cullmann into branch 'master'. add *.md.html M +1 -1 data/syntax/markdown.xml https://invent.kde.org/frameworks/syntax-highlighting/-/commit/0198ada8fcb79fd059358a23747d2d65ed5bfa09