There seem to be a growing number of literacies. I guess it depends on how specifically you think the label should be applied. This site developed by Mozilla offers tutorials intended to develop your understanding of web site development. Clearly, anyone can now generate content available online without knowing much about html, css, etc. However, perhaps if you are an advocate of the Program or be Programmed perspective, you could use these resources to develop a very thorough understanding of what goes on to get content to you. I do not intend to make light of this knowledge – there is something quite satisfying in creating from scratch.