HTML5 canvas in real time

This e-book is an interactive e-book this means that the user can enter datas in the pages and content of these will conform to the new values.
To enter these datas, in the pages of the e-book, have been implemented controls similar to those that can be found on the Internet pages and also an executing button to impart the command to adapt the content of the page to the new values.
The subject of the e-book is the Compose HTML5 Canvas, that for its characteristics well suits to be documented ...