I have successfully added to Firefox (a local development copy on my machine only) a new CSS property, “transition-interrupt:special”, and a new Web-Animations property, “KeyframeEffect.composite:relative”. It is still proof of concept and unfinished, but worth celebrating.
This won’t work in any browser except the build on my machine, and I have not yet uploaded a patch:
red: transition:transform 1.0s ease-in-out regular;
green: transition:transform 1.0s ease-in-out special;
purple: transition-interrupt: special;
KeyframeEffect.composite mode “relative” also won’t work in any browser except mine. Using Web-Animations one can manually construct relative animations, but automatic conversion was needed to create transition-interrupt, as it was with OS X view animation
Concepts I took for granted in Core Animation, like the separation of discrete and animated values, just aren’t present. For instance an “underlying value” can include animation, so I am struggling with issues like this: https://dbaron.org/css/test/2015/transition-starting-1
@kvndy What's it do?
@fool Relative animation, animated additively from the old value minus the new value, to zero.
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