pinspacing property test
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pinSpacing:false
ScrollTrigger.create({ trigger:".box1", start:"top 600px", end:"+=400", markers:true, pin:true, pinSpacing:false, });
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pinSpacing:true (default)
ScrollTrigger.create({ trigger:".box2", start:"top 600px", end:"+=400", markers:true, pin:true, // pinSpacing:false, });