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vim natively ships with CSS, Javascript & HTML syntax highlighting provided the feature is switched on.

vim also has completion features documented at http://vimdoc.sourceforge.net/htmldoc/insert.html#ft-css-omni

https://github.com/kaihendry/vim-html5/ provides an example with a video tutorial of howto integrate with validator.nu, jshint, csslint et al.


XHTML5 or polyglot documents

Emacs ships with nxml-mode, a major mode for editing XML which does on-the-fly validation with RELAX NG schema. You can plug fantasai and hsivonen's schema into nxml-mode. The necessary shim code is included in the hober/html5-el project on github.