[draft] Combined weekend playground polyfills (CI smoke)#1702

Draft

bkaradzic-microsoft wants to merge 22 commits into

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bkaradzic-microsoft:weekend/all-combined

Commits on May 16, 2026

Add File/FileReader JS polyfill for Babylon Native Playground

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Copilot
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Re-enable 19 GLTF/OBJ serializer tests now unblocked by File polyfill

bkaradzic-microsoft
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Add DOM polyfills (TextEncoder, PointerEvent, AbortController, document.createEvent)

bkaradzic-microsoft
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Replace OpenGL ExternalTexture throw-stubs with inert default-value stubs
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Add fetch() polyfill for Playground
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Add .env fallback for cubemap loads + re-enable 7 tests
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Triage post-SPIRV-Cross-bump pixel-diff fallout
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Update reason strings on excluded pixel-diff tests
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Add ES2020+ -> ES2019 syntax repair polyfill for Chakra
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Commits on May 18, 2026