The main tip I worked out the hard way, was making sure your save the blender project file and json file with the same name as the project name and in the right directory within the blender project folders. Maintenance update with a smattering of bug fixes for the long-standing text editor. I created the project name with the default settings and could edit the html, css and java from the project manager panel (project manager editor in the browser window not within Blender) Versatile graphics app is now a macOS Universal app, enabling it to run natively on Macs with Apples M1 chip. I was trying to set this all up manually, but figured it out using the project manager within Blender. I seem to be missing how this all links with the CSS and java files too. Do you mean I should export the blender project as the complete blend4web html file and add your html code suggestions to this main file? Or is this to be a separate html file specifically for the annotations? In the tutorial you say to enter the body text under the canvas div. This did not happen and I just got a black screen in my browser. I downloaded your sample project files and tried running the custom_anchor.html expecting to see your box with the anchor text links. I seem to be missing something when trying the expert mode.

Text editor for mac os 10.13.2