(hasParent) ? parent.opacity : value;
The parent's opacity value acts as a multiplier for the child's
Constrain the max width of a text layer using the scale property
How to use the Composition Width & Height expression to center and scale a layer
Maintain scale of a layer when parented to another layer - even if that layer has a parent. Apply to scale property of child layer.
AfterEffects_Tricks
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