docs: document OffscreenCanvas (2.8)#3084
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crowlKats merged 6 commits intodenoland:2.8from May 5, 2026
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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
Hajime-san
reviewed
May 1, 2026
Per @Hajime-san — Deno's OffscreenCanvas supports only \`bitmaprenderer\` and \`webgpu\`; \`2d\` / \`webgl\` / \`webgl2\` return null. Replaces the broken 2D drawing example with a bitmaprenderer image-encode flow and rewrites the "limitations" line into an explicit "Supported rendering contexts" subsection. WebGPU is supported, so it no longer appears in the unsupported list. Refs denoland/deno#29357
crowlKats
approved these changes
May 5, 2026
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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.