fix: isolate MDL detail stacking context from ancestor overlays - #11764
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Use `isolation: isolate` so MDL's internal z-indices (#detail at z-4 in particular) stay contained within MDL's own stacking context. Without it, the detail panel competes with ancestor overlays such as `vaadin-app-layout`'s backdrop (z-2) and renders above them. Fixes #11762
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vursen
approved these changes
May 18, 2026
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This ticket/PR has been released with Vaadin 25.2.0-alpha8. |
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When
vaadin-master-detail-layoutis nested insidevaadin-app-layoutand both are in overlay mode, the MDL detail panel renders above the app-layout's drawer backdrop. The backdrop becomes click-through behind the detail panel, so users cannot dismiss the drawer by clicking the visible part of it.The root cause is a stacking conflict: MDL's
#detailusesz-index: 4for its own internal layering (above its placeholder, backdrop, and outgoing-detail wrapper), and that z-index applies in the nearest ancestor stacking context — the app-layout's stacking context, where the drawer backdrop sits atz-index: 2.Applying
isolation: isolateon the MDL host contains the internal z-indices in MDL's own stacking context. MDL as a whole then stacks at its default level in the parent, and ancestor overlays (app-layout backdrop, dialogs, etc.) layer above it as expected. Theoverlay-containment='page'mode is excluded — there, the detail usesposition: fixedand must escape MDL's stacking context to layer above the page.Fixes #11762
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