We intend to support compositor animations for individual transforms, and motion-path (in the future). Those use different properties, so we have to extend the usage of `eCSSProperty_transform` (e.g. [1][2], ... and a lot of places) to display item [3] which returns a property set or an array of transform-like properties. [1] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/layout/painting/nsDisplayList.cpp#8041-8042 [2] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/dom/animation/KeyframeEffect.cpp#1695 [3] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/layout/style/LayerAnimationInfo.h#30-31
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We intend to support compositor animations for individual transforms, and motion-path (in the future). Those use different properties, so we have to extend the usage of `eCSSProperty_transform` (e.g. [1][2], ... and a lot of places) to display item which returns a property set or an array of transform-like properties [3]. [1] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/layout/painting/nsDisplayList.cpp#8041-8042 [2] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/dom/animation/KeyframeEffect.cpp#1695 [3] https://searchfox.org/mozilla-central/rev/5e3bffe964110b8d1885b4236b8abd5c94d8f609/layout/style/LayerAnimationInfo.h#30-31