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rate for dragging when selecting text?

Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Does this community have any insight regarding the rate at which content in a scrollable element moves when selecting text and dragging beyond the element's container?


For example, if you select some text from the top here with your mouse:


and then drag down out of the browser window, your selection is automagically extended while you scroll.  Moves a little slower when you are closer to the boundaries.  Seems to reach a maximum velocity at a certain distance.


I want to know what the rules for that scroll rate are.  I want to re-create that functionality with greensock.


Tech note: the reason I want to re-create it and not use that functionality 'out-of-the-box' from the browser is that for other technical reasons I need to return false / preventDefault on the mouseDown event.  This prevents the auto-scrolling.

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