docs: document OffscreenCanvas (2.8)#3084
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Adds an OffscreenCanvas section to the Web platform APIs reference, describing the new API available in Deno 2.8. Covers a typical 2D-drawing + convertToBlob() example, common use cases (server-side image generation, off-thread drawing, thumbnails), and notes that WebGL/WebGPU contexts on OffscreenCanvas are not yet supported. Refs denoland/deno#29357
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Summary
Documents the new
OffscreenCanvasweb API shipping in Deno 2.8 (denoland/deno#29357).runtime/reference/web_platform_apis.md.convertToBlobexample and a list of typical use cases (server-side image generation, Web Worker off-thread drawing, thumbnails).Test plan
deno task serve— section renders ahead of the "Deviations of other APIs from spec" heading.