Re: [touch-events] Spec should be explicit on whether the order of elements in TouchLists is relevant

>Personally, I feel it would be better to write a generic note 
explaining that the order in which Touch objects can be found in the 
various TouchList objects can change arbitrarily (particularly in 
situations when a touch is added or removed), and that authors should 
not rely on it - instead, to explicitly track a touch in a multi-touch
 case, they should refer to the unique identifier associated with a 
touch. Happy to draft/PR something.

having said that, if we see that there are scripts in the wild which 
rely on the (fairly rock solid, from my testing) Safari/iOS behavior 
(order always preserved during gesture, order preserved when a touch 
is removed, new touches always added at the end), then perhaps we 
could document that "generally" that's the behavior, but that authors 
should nonetheless not rely on it? or can we even mandate that 
browsers should/must do it this way (and file relevant bugs against 
those that don't)?

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Received on Tuesday, 5 April 2016 13:45:46 UTC