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Component Lab / navigation-layout / resizable-glass-split-panel

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Resizable glass split panel

A responsive layout primitive for inspectors, comparisons, and editing workspaces. Its semantic separator reports the current split and supports arrows, Home, and End as well as direct pointer dragging.

Lab tested Responsive Dark mode Interactive
Version
1.0.0
Updated
2026-08-02
Dependencies
Zero
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Implementation field notes

Use resizable glass split panel confidently.

The preview and source are only the starting point. Use these notes to decide where the component fits, preserve its accessibility contract, and verify the adapted result.

Good fit for

  • Code editors
  • Before-and-after tools
  • Document inspectors

This layout utilities pattern works best when its purpose is clear in the surrounding page hierarchy.

Accessibility contract

  • The divider uses a labelled separator role with synchronized value attributes.
  • Arrow keys, Home, and End provide complete keyboard resizing.
  • Both panes retain readable minimum widths at the allowed bounds.

Integration plan

  1. Copy the standalone HTML and scoped CSS into an isolated page.
  2. Adapt divider accent, first pane, second pane, text color through the Inspector.
  3. Connect the defensive JavaScript, then test every control with a keyboard.
  4. Review the result at 375, 768, 1024, and 1440 pixels before shipping.

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