Expand DevInsetInspector with DOM layer diagnostics & viewport units#94
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Add the metrics that pinpoint which element causes a standalone-PWA fullscreen gap: per-layer rendered heights for <html>, <body>, and #root (html=crimson, body=green, #root=blue), plus 100vh/lvh/svh/dvh probes, docEl.client, screen.availH, iOS version, split nav.standalone vs display-mode flags, and a GAP (innerH − #root.bottom) readout that goes red when the shell doesn't fill the window. Visual layer bottom-edge markers overlay the live screen so a short body line is obvious at a glance, and a Copy button dumps the full report for bug threads. Panel scrolls within an 82vh cap to fit the larger readout. https://claude.ai/code/session_01S9vEqUbyVKdXMWwHB7Vohn
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Summary
Enhanced the developer layout inspector to surface DOM-layer geometry (html, body, #root) and viewport unit measurements alongside existing safe-area insets. This addresses the core debugging need: identifying which DOM element is causing letterbox gaps in standalone PWA mode on iOS.
Key Changes
readLayer()to measuregetBoundingClientRect()for<html>,<body>, and#rootindependently, with color-coded visual markers (crimson/green/blue) overlaid on the screen at each layer's bottom edgemeasureUnits()to resolve actual computed heights for100vh,100lvh,100svh,100dvhby creating hidden test elements—the only reliable way to see what each unit resolves to on a given devicegapmetric (innerHeight − #root.bottom) to quantify the mismatch between window and rendered contentnav.standaloneflag,display-modemedia query,docElement.clientWidth/Height,screen.availHeight, and visual viewport offsetbuildReport()function and UI button to export a plain-text diagnostic dump suitable for pasting into bug reportsImplementation Details
html→ red-emergency (crimson),body→ green-ais,#root→ cyan-adsb (blue)—matches Vertex's existing palettenavigator.userAgent; falls back to "—" if unparseableMath.round()for pixel-perfect integer valueshttps://claude.ai/code/session_01S9vEqUbyVKdXMWwHB7Vohn