Just in case it can be intersting to someone...
Here is a screensot of my Sciter engine ( http://www.terrainformatica.com/sciter/main.whtm ) with JUCE library used as a graphics/windowing backend:
Here is the same document ( http://www.terrainformatica.com/wp-content/uploads/2014/02/S3M.png ) opened in Sciter with original native Windows backend (Direct2D). As you see there are some differences in rendering details, working on them.
Basic concept: Sciter is wrapped into juce::Component and so it can be used anywhere inside JUCE infrastructure.
Among other HTML/CSS elements Sciter view may also contain other juce::Components defined in markup as <widget type="{name}">. Special callback provided by the host application will be responsible for binding {name}s with juce::Component derived things from host application side.