This feature, of embedding in HTML pages, requires
the "develop" branch. Release-2.11 is not enough. The feature embed html feature will be standard in release-2.12 but it didn't quite make it in to release-2.11.
hosted2 is running the "develop" branch and you are welcome to use it for the time being. It won't be 100% reliable because some development takes place on it but it will be 80% reliable.