CSS Stacking Context Inspector
Check CSS snippets for properties that create new stacking contexts.
What the CSS Stacking Context Inspector does
Check CSS snippets for properties that create new stacking contexts. A transformed card with z-index children can trap a tooltip beneath a sibling outside the card Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: The checker looks for common triggers such as transform, opacity, filter, isolation, and contain.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the CSS Stacking Context Inspector do?
Check CSS snippets for properties that create new stacking contexts. A transformed card with z-index children can trap a tooltip beneath a sibling outside the card.
What should I keep in mind?
The checker looks for common triggers such as transform, opacity, filter, isolation, and contain
Does it upload my input?
No. The CSS Stacking Context Inspector runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.