What is the difference between focus/blur and focusin/focusout for event delegation?
focus and blur do not bubble, so they cannot be used with traditional event delegation. focusin and focusout are bubbling versions of focus and blur. Use focusin/focusout for event delegation with form fields.
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More FAQs in Event Delegation Best Practices
Use closest() for nested clicks, check e.target before handling, choose the right parent (closest one containing all children), do not overuse stopPropagation (it breaks delegation), and be aware of non-bubbling events.
Use capturing phase (addEventListener with true) or use bubbling alternatives: focusin/focusout instead of focus/blur, mouseover/mouseout instead of mouseenter/mouseleave. These alternatives bubble and work with delegation.
Because stopPropagation prevents the event from bubbling to the parent, which breaks delegation. The parent listener never receives the event. Only use stopPropagation when you explicitly want to prevent delegation.
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