What this changes
PDF pages are not editable DOM documents. Text is often part of a rendered page surface, so moving or editing text requires cleanup, replacement drawing, async tile handling and preview stability without erasing unrelated content.
ArchitectureBrowser-native document runtime architectureA public architecture view of Browser Core: browser-side preview, PDFium-backed rendering, deterministic operations and backend-authoritative export.RuntimeA browser-side runtime for safe realtime document interactionHow Browser Core coordinates browser-local preview, runtime readiness, replayable operations, safe compositing and backend-authoritative export.Render graphRender graph planning for safe browser PDF previewHow Browser Core turns local document edits into structured visual responsibilities, command buffers, tile resolution and safe final preview output.PDFium WASMPDFium WASM for accurate browser-side PDF previewHow Browser Core uses PDFium WebAssembly for local page rastering, text awareness, textless tiles and safer live PDF previews.Textless tilesTextless tiles for cleaner PDF text editing previewsHow Browser Core removes old PDF text from live preview with small PDF-aware clean tiles instead of fake white overlay masks.Local-firstLocal-first PDF preview with backend authorityHow Browser Core gives PDF editing immediate browser-side preview while keeping save, export and persisted document state backend-authoritative.Operation replayOperation replay for refresh-safe document previewsHow Browser Core keeps local edits visible across refreshes while preserving backend-authoritative save and export.Dirty renderingDirty rendering for focused, safe PDF preview updatesHow Browser Core tracks what changed in the live preview using dirty nodes, dirty regions, command buffers and safe final compositing.Debug visibilityDebug visibility for browser-side PDF runtimesHow Browser Core makes local PDF preview behavior observable across operations, render graph state, dirty rendering, tiles, interaction and performance.Technology previewTechnology preview status for Browser CoreCurrent Browser Core technology preview status: browser runtime active, PDFium-backed preview path, backend-authoritative export and roadmap limits.RoadmapBrowser Core engineering roadmapThe Browser Core roadmap for stable local PDF editing, safer visual cleanup, broader document coverage and production-grade save/export workflows.SDK directionFuture SDK direction for embedded document runtimesFuture SDK direction for embedding Browser Core style document runtime capabilities into document products.ArticleWhy PDF editors feel slowBackend render loops make every edit wait for network and regeneration. A browser runtime can make preview feel immediate.ArticlePDFium WASM browser renderingWhere PDFium WebAssembly fits in a browser-side preview path for page raster work, text readiness and clean composition.ArticleTextless tile renderingWhy source-suppressed tiles are cleaner than white overlay masks for PDF text replacement previews.ArticleLocal-first document runtimeHow browser-owned preview sessions and backend-authoritative export can work together without pretending the browser is the final source of truth.ArticleRender graph document editingA public render graph story for document preview, affected regions and predictable compositing.ArticleDirty region rendering in the browserWhy affected-region rendering matters when small edits should not redraw the entire document preview.ArticleOperation replay for document editingRecovering local preview state with deterministic operations while clearing committed work after backend save.ArticleBrowser runtime vs backend render loopA practical comparison of local interactive preview and backend-authoritative PDF save/export.ArticleDebug visibility for document enginesWhy document runtimes need visible health, replay status, provider state and frame timing without exposing private internals.ArticleGPU document rendering roadmapHow GPU compositing can evolve browser-native document runtimes after the safe Canvas/PDFium-backed path is established.
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Render graph planning for safe browser PDF preview
The render graph is the browser-side planning layer that answers what needs to be drawn now for the current document preview and local edits.
Technology previewPDFium WASM activeReplay enabled
Runtime pipeline
From PDF bytes to final composite, all inside the browser preview path.
01Local operation
02Graph node
03Command buffer
04Tile resolution
05Final composite
06Canvas preview
Local-firstDeterministicReal-time previewBackend-authoritative export
Browser Core approach
Runtime-first preview
Browser Core turns each local operation into structured visual responsibilities before anything is drawn: source cleanup, replacement content, selection/debug overlays and destination cleanup only when it is safe. Those responsibilities become command buffers that are resolved into a final composite preview.
What this solves
Separates what the user did from what the browser must draw
Keeps source cleanup separate from replacement text so moves do not erase unrelated PDF content
Lets async textless tiles resolve without forcing destructive fallback masks into the preview
Supports replay after refresh by rebuilding the same visual responsibilities from local operations
Current status
Preview planning layer
Inspectable command buffers
Dirty-region awareness
Safe final composite filtering
Backend export remains separate
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Technology preview