Web-based HTML snippet editor

Question

I'm looking for a web-based HTML editor. I am NOT looking for a WYSIWYG editor. The author needs to be able to edit the HTML directly, and I'm looking for features like syntax highlighting, tag auto-completion, whitespace formatting - stuff you'd expect in a typical IDE. It also needs to be able to edit HTML snippets that aren't necessarily valid HTML on their own (for example, just a table row without table tags) without puking.

Does anything like this exist?

Answer 1

markItUp!

markItUp! is a JavaScript plugin built on the jQuery library. It allows you to turn any textarea into a markup editor. Html, Textile, Wiki Syntax, Markdown, BBcode or even your own Markup system can be easily implemented.

CodeMirror

CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. If a mode has been written for the language you are editing, the code will be coloured, and the editor will optionally help you with indentation.