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web/stacking-contexts-why-z-index-9999-can-still-lose-to-z-index-2.md Stacking contexts: why z-index: 9999 can still lose to z-index: 2 You give a dropdown z-index: 9999 and it still hides behind a box that only says 2. The number is not too small: browsers sort layers in… 6 min read · 4 Nov