Alinous-Core Code Editor on the web is based on the CodeMirror. It is extended by writing language support plugin of the CodeMirror.
In addition to the Alinous-Core, it natively supports Html and CSS, too.
The Alinous-Core programming language mode supports the grammar.
It colors the reserved words of programming language, comments, variables, numbers, and strings. If there is a wrong parts, it is colored red.
The CodeMirror supports Html.
The Alinous-Core extends HTML, but it is familiar to the HTML format. Therefore you can use Html editor on the same way with normal Html.
The CodeMirror also supports Css.
You can edit all content and program with this editor. About more detail, please take a look at Edit Contents.