The runtime has JavaScript support, it does not have a brand new interpreter.
The runtime has CSS support, it does not have a brand new interpreter.
The runtime has HTML/XML syntax. Why would they write a brand new interpreter?
Mappping XML to a small subset of UI objects is so simple you don't really need to pull in an entire browser runtime for it.
The runtime has JavaScript support, it does not have a brand new interpreter.
The runtime has CSS support, it does not have a brand new interpreter.
The runtime has HTML/XML syntax. Why would they write a brand new interpreter?