An unofficial Visual Studio Code extension for RmlUi documents (.rml) and style sheets (.rcss).
Features
RML is close to XHTML and RCSS is close to CSS, so this extension doesn't add new languages. It opens .rml files as HTML and .rcss files as CSS, then teaches VS Code's built-in HTML and CSS support about what RmlUi adds. You keep the editor's usual highlighting, Emmet, formatting and folding, plus:
No false warnings on RCSS-only properties such as decorator, nav-down, tab-index, font-effect and image-color, or on the @spritesheet and @decorator at-rules
Autocomplete and hover docs for those properties and their keywords, with links to the RmlUi documentation
RML elements and attributes: <rml>, <handle>, <tabset>, <tab>, <panel>, <template>, <body template>, <progress direction>, and the data binding attributes (data-model, data-if, data-for, data-value and others)
Known Issues
RmlUi's additions apply to all HTML and CSS files, so they also show up in autocomplete in ordinary web files
Standard CSS that RmlUi doesn't support, such as grid, still autocompletes, and values aren't checked against what RmlUi accepts
Attribute families such as data-class-*, data-attr-* and data-event-* can't be listed generically. Only data-event-click autocompletes; the others work but have no hover docs
Other extensions that act on HTML files will act on .rml files too
