Hello Philip_Fong, please do not get discouraged so soon, you have to know Blender and Blend4Web to get all its potential without scripting, look at this blend, transparency is very animated, open it with b4w and run the preview if you do not understand it I explain it somehow.
Regards.

Hello, I suppose that happens to you because Blender's extrapolation by default of the key frames of the movement is accelerated at the beginning and slowed down at the end of the animation, this is a more real movement. If you want a constant movement you should go to Graph Editor and selectable in Channel / Extrapolation Mode / Linear Extrapolation. This will make a constant infinite movement.

1) use the click of the meta-tag as a trigger event to move down the logic path. I.E. you can't proceed until you click the tag. (but it appears selecting the meta-tag is not registered as a selected object).

You do not have to program, you do the empty child of a plane for example and the plane serves as selectable object, you can make it not render so that it is not seen.

Hi, could you put a label on the label that does not render and is detected by the mouse?

Hi, it is true that the animated scale does not work with physical objects, it only occurs to me to duplicate the scaled final object, apply its physics and hide or show the object of our interest.

Thanks Will, that solution that you comment is good only that the movement is less perfect. It seems to be that what does not support B4W are 2 restrictions at the time. Another new challenge for B4W.
Thanks again.
Regards.

Hello Will, in my case it does not work. I have a blue object that is moving, the blue object is the parent of the yellow object, the yellow object has a restriction so that it always points to the red object and the red object has another restriction for That points to the yellow object. If we launch the animation in Blender it is seen as it works but in B4W it does not. Did you know how ?.
Attached is an example.
Thank you

Hello, I do not get the Track To restriction working in b4w, I thought applying it to Blender would automatically work in B4W, would not it? It has to be through the API?

I think it's perfect, maybe it's the right way to do it. The above solution tried to bake the animation of the pose and the animation of the object independently.
Regards.

I think not, this option is meant to optimize resources, its function is not to render faces that do not receive light, if you put a light that illuminates the face that appears transparent you will not have to disable Backface Culling.
If your scene is well lit you will not have this problem, if you specifically want to leave objects without receiving light and also want them to be seen, you must deactivate Backface Culling in their material.

I hope you understand me, the translation is with google.