Z-index Map & Debugger
Visualize CSS stacking contexts and debug z-index conflicts
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Common Use Cases
Essential for front-end developers debugging z-index stacking issues, UI engineers troubleshooting modal and dropdown layering, and designers verifying CSS specificity and visual hierarchy in complex layouts.
How Z-Index Stacking Works
Z-index only applies to positioned elements (relative, absolute, fixed, sticky). Elements create stacking contexts based on their z-index value, parent stacking context, and DOM order. This calculator maps your element's properties to its effective stacking order.
Fun Fact: CSS introduced the z-index property in 1997, but stacking contexts weren't fully standardized until CSS3! Even today, properties like 'opacity' and 'transform' can unexpectedly create new stacking contexts.
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