Sticky position

De div met position: sticky en position: -webkit-sticky moet een waarde voor top hebben.
Zonder een waarde voor top gedraagt de als sticky bedoelde div zich als een div met position: relative.
Als we de sticky div links een bepaalde positie t.o.v. zijn container willen laten innemen, kunnen we, om de sticky div horizontaal goed gepositioneerd te houden na het veranderen van de grootte van het venster (resizing), het beste de div expliciet een bepaalde breedte geven en dan een linkerpositie zodanig dat de div niet rechts geheel of gedeeltelijk buiten z'n container valt.
Ook moet de sticky div een hogere waarde voor zIndex hebben dan de div die er bij scrollen eventueel overheen gaat lopen (als die laatste div een zIndex heeft)).
Tenslotte: het is een goed idee om zowel de container div als de sticky div box-sizing: border-box te geven.
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sticky div
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