malformed CSS comments in src/web/skeleton/Plain.html and src/web/skeleton/Hybrid.html
In both mentioned files there is a style tag, which includes a CDATA section. The begin and the end of the CDATA section is commented out using CSS comments, but the comment for the end of the CDATA section is malformed:
* ]]> */
which probably should be:
/* ]]> */
This also shows in the source view of the live demos.