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.grandparent { position: static; } /* NOT a context */ .parent { position: relative; } /* IS a context */ .child { position: absolute; top: 0; left: 0; } /* .child positions relative to .parent, not .grandparent */ /* Check: if no positioned ancestor, absolute positions to viewport */ .no-context { position: absolute; top: 0; left: 0; /* goes to viewport top-left */ }
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