This video tutorial shows how to export a model from Blender in the X3D file format. There are two ways of embedding X3D file in a web page, part 1 shows a way where the web page can be viewed locally without having to be uploaded to a web server.
All this is made possible by software from the open source project X3DOM (pronounced X freedom).
Key points –
How to export a model from Blender in the X3D file format.
How to open the X3D file in a text editor (notepad++ used in tutorial)
How to convert the X3D file into a HTML web page with the 3D data embedded in it (using a converter utility provided by X3DOM).
How to view the page in a browser that supports Webgl (Firefox, Chrome and Safari, latest versions).
How to modify the 3D data in the web page.