[scroll-animations-1] naming the initial value of animation-range #8406
Description
This depends a bit on #8405 and how we want to think about animation-range.
The two keywords under consideration are: normal and auto.
normalimplies a bit more thatanimation-range-start/endtake their "normal value". (Currently the initial value uses the start/end of the timeline, so I think it's more appropriate as defined right now.)autoimplies a bit more that ananimation-range-start/endvalue is calculated based on something. (This might be more appropriate if we calculate the used value of these properties based on other properties in some way.)