Design
#92
Adapt videos to the viewing environment
Consider several formats (size, frame rate, audio compression, etc.) depending on the bookContext in which the videos will be watched (desktop computer, WiFi tablet, EDGE smartphone, etc.).
Videos should be optimized outside of the website, ideally during post production. If that is not possible, use services like YouTube or Vimeo which offer, as standard, several optimized formats (SD, HD, etc.).
Development
#11
Favor CSS over images
Use CSS3 rule-sets instead of images as a style sheet file is much smaller, especially when compressed.
In addition, calling a style sheet only generates one HTTP request, whereas each image generates an HTTP request.
