web-mode.el is an emacs major mode for editing web templates aka HTML files embedding parts (CSS/JavaScript) and blocks (pre rendered by client/server side engines).

web-mode.el is compatible with many template engines: PHP, JSP, ASP, Django, Twig, Jinja, Mustache, ERB, FreeMarker, Velocity, Cheetah, Smarty, CTemplate, Mustache, Blade, ErlyDTL, Go Template, Dust.js, Google Closure (soy), React/JSX, Angularjs, ejs, Nunjucks, etc.

More infos on https://web-mode.org/