Reply to post of user Joshea
Since …Capili011… didn't get back to you, I would like to pick up a similar problem.
The "annotation" anchors works great. However the "custom element" is baffling.

I have intermediate HTML and JavaScript coding skills, and working on a MacOS 10.13.2 with blender 2.79 and blend4web 17.12.0.
Problem: getting "custom element" to engage.

I tried running a script through the Blender text editor to no avail. Where or how do I get "custom element" to run the script?

I may have solved my own problem. I went back to "Annotation" and used the following HTML code (first attachment) in both the Title and Description lines of Meta Tags. It gives the freedom of choice for color and size.

If there's a disappointment, I can't change the background color of the text…yet. If someone figures it out, please post.
Second and third attachments are the results.

Reply to post of user Alexander Romanov
What are you trying to do? What is not clear?

Since …Capili011… didn't get back to you, I would like to pick up a similar problem.
The "annotation" anchors works great. However the "custom element" is baffling.

I have intermediate HTML and JavaScript coding skills, and working on a MacOS 10.13.2 with blender 2.79 and blend4web 17.12.0.
Problem: getting "custom element" to engage.

I tried running a script through the Blender text editor to no avail. Where or how do I get "custom element" to run the script?

Withdrawing the question.

Tutorial and blend4web is great.

I made a pair of shoes, and have them rotating beautifully in Blender (have them parented to an empty), however when I use the fast preview, no rotation. I've gone over it about 4x, and can't find the problem.
I'll attach an image; and any thoughts to a solution?

I figured it out. Empty wasn't being selected before Fast Preview.