Re: Proposal: will-animate property

In Benoit's original proposal (where only transform, opacity, and scroll
were valid values), will-animate values other than 'auto' cause the
creation of a stacking context. This indeed seems desirable for properties
that themselves will create stacking contexts when given non-default values
(e.g. transform, opacity, perspective, and filter). What about for other
properties (e.g., consider "will-animate: left")? Is it reasonable to
restrict the creation of a stacking context by will-animate so that it only
happens when at least one of the properties listed creates a stacking
context when given a non-default value?