[x3d-public] id attribute proposal

[Andreas Plesch]

http://blogs.adobe.com/dreamweaver/2015/06/the-state-of-svg-animation.html

has a lengthy discussion on SVG animation. It concludes that animation via
the DOM are in many cases the best option because SMIL is deprecated and
easily replaced by more powerful JavaScript.

I was hoping that the article goes into how collisions between SMIL, CSS
and DOM based animation are resolved but it does not. Apparently it is not
a concern.

Andreas

It turns out that SVG uses the SMIL animation model:

https://www.w3.org/TR/smil-animation/

It defines that animation does not affect the DOM value of an animated
property but a separate presentation value which is only accessible to the
animation runtime, and not the DOM. The specification does not go into what
values are used for rendering but the idea is certainly that the
presentation value is used. This would make it necessary for a renderer to
keep track of what attributes are currently animated by SVG and which ones
are not. Since the animate element is the only possible way to do this in
SVG, this is feasible. For the richer X3D scene graph, this would be much
harder and does not seem like a good model to follow at first glance.

Andreas
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