Stacking Context & Z-index — Learning Bundle
This learning bundle connects two CSS ideas. A stacking context keeps its paint order separate. z-index orders boxes that can take part inside that context. The bundle is not one standard CSS term.
Another example
A tooltip with z-index 999 may still hide behind another layer. Its transformed parent can create a separate stacking context.
Main parts
- 01Outer constraint
- 02Content and spacing model
- 03Computed size or reflow result
Use it when
Find the stacking context that matters before you change a z-index value.
Do not use it when
Never use a huge z-index value to hide the real boundary between contexts.
Name used in code
stacking context / z-index Before you ship
Check that every member concept has its own name and link. Show all members in the same situation. Give a visible rule for when each one applies and which groups are valid. Never present the bundle as one canonical pattern or as parts that can be swapped freely.
Outcome: Use Stacking Context & Z-index — Learning Bundle to compare its member concepts. Keep their boundaries clear, then decide which members apply and which can work together. User context: A tooltip with z-index 999 may still hide behind another layer. Its transformed parent can create a separate stacking context. Learning bundle to unpack: Stacking Context & Z-index — Learning Bundle. Canonical members: Stacking Context, z-index Why this comparison helps: Find the stacking context that matters before you change a z-index value. Do not treat the bundle as one pattern when: Never use a huge z-index value to hide the real boundary between contexts. Comparison requirements: Name every member concept on its own. Explain its job and limits. Show every member in the same real situation. Give a visible sign for when to use, combine, or leave out each member. Decision quality: Keep platform and evidence limits clear. Show which members can work together. Point out false matches, unsafe swaps, and cases that need another concept. Acceptance criteria: A reader can explain each member in one sentence and tell them apart in the example. They can defend the chosen member or valid group and open every canonical guide. Evidence and limits (evidence boundary): This is not a normative standard. Its name, limits, and expected behavior can change from one source to another. Unknowns to confirm: Target platform, decision setting, limits, and evidence needed to use, combine, or leave out members.
Check this request
Review the current use of Stacking Context & Z-index — Learning Bundle. Definition: This learning bundle connects two CSS ideas. A stacking context keeps its paint order separate. z-index orders boxes that can take part inside that context. The bundle is not one standard CSS term. Release checks: Check that every member concept has its own name and link. Show all members in the same situation. Give a visible rule for when each one applies and which groups are valid. Never present the bundle as one canonical pattern or as parts that can be swapped freely. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.