event.preventDefault() vs event.stopPropagation() vs return false
event.preventDefault(): Click square with prevent Default.
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event.stopPropagation(): Click inside first square normally, Click inside square with stopped propagation.
Without e.stopPropagation
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With e.stopPropagation
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return false : Click inside first square normally, Click inside square with return false. return false stop both preventDefault and stopPropagation.