Hi All, Time fraction calculation algorithm (http://w3c.github.io/web-animations/#calculating-the-time-fraction) contains several steps for the case when iteration duration is zero. It's not obvious to understand the idea of thes algorithm looking at algorithm only. May be it makes sense to add non-normative section explaining why these steps are needed and why in this case time fraction is not simply zero or 1?
Thank you, Sergey G. Grekhov
