Changes

Servo_DeclarationBlock_SetPropertyById_WithInitialSpace_Bench is the same, but with the string " 10px" with an initial space. That initial space is less typical of JS animations, but is almost always there in stylesheets or full declarations like "width: 10px". This microbenchmark was used to test the effect of some specific code changes. Regressions here may be acceptable if Servo_StyleSheet_FromUTF8Bytes_Bench is not affected.