Alison Francis,Senior Science Journalist
Implementers shouldn't need to jump through these hoops. When you find yourself needing to relax or bypass spec semantics just to achieve reasonable performance, that's a sign something is wrong with the spec itself. A well-designed streaming API should be efficient by default, not require each runtime to invent its own escape hatches.
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Rendering a character as a lower block and then as an upper block gives you two “frames” of motion within the same character and looks much smoother.