It depends on Scintilla's ability to distinguish embedded languages, currently it distinguishes embedded SGML, Javascript, VBscript (two versions?), ASP javascript, Python, and PHP.
Those are mapped to styles within HTML, but some of them are currently mapped to copy Javascript because nobody knows what they are? And for those separately mapped like php, python, javascript I suspect most colour schemes don't give them their own colours and/or the filetype file maps them to "standard" colours.
See `highlightingmappings.h` for how Scintilla styles are mapped to names, and filetypes.html for the mapping to colour names.