While Markua does not support inline HTML, it does support some HTML entities like So, typing this in your manuscript: Lorem ip sum dolor ...will produce this in a book: Related ArticlesLeanpub Courses Support iFramesHow Can I Insert a Page Break?Can I use Leanpub to produce a LaTeX file from my Markua document?What is Leanpub's CourseAI service?I want to use Leanpub's AI services for authors to create an index for my book, using my book manuscript. Does my book need to be written in Markua 0.30, Leanpub's plain text book manuscript markup syntax?