[1] Web Applications 1.0 r5869 note canvas.toBlob() as a future feature ( ( 版)) http://html5.org/tools/web-apps-tracker?from=5868&to=5869
[2] Web Applications 1.0 r6134 Attempt to define canvas.toBlob(). ( ( 版)) http://html5.org/tools/web-apps-tracker?from=6133&to=6134
[3] Issue 67587 - chromium - Add toBlob to Canvas element. - An open-source project to help move the web forward. - Google Project Hosting ( 版) https://code.google.com/p/chromium/issues/detail?id=67587
[4] Make the toBlob() callback argument non-nullable · whatwg/html@8cee637 ( 版) https://github.com/whatwg/html/commit/8cee637caaed8512afb64c7c31a4e35060da3abe
[5] Make quality an explicit argument for canvas image conversion (domenic著, ) https://github.com/whatwg/html/commit/7d25c4c2452b705220417ffb951c9b89e04ba50b
[6] Define encoder failure actions for toDataURL/toBlob (junov著, ) https://github.com/whatwg/html/commit/93c0a157dbe238582584a0e8c2f621958bb39a45
[7] Remove HTMLCanvasElement.prototype.toBlob; replace with promise-returning convertToBlob · Issue #379 · whatwg/html () https://github.com/whatwg/html/issues/379
[8] Fix toBlob() and convertToBlob() (annevk著, ) https://github.com/whatwg/html/commit/d28a66a8df60a6d7719f950dc2965d893d384b22
[9] convertToBlob() and toBlob(): what happens in parallel? · Issue #3386 · whatwg/html () https://github.com/whatwg/html/issues/3386
[10] Fix toBlob() and convertToBlob() by annevk · Pull Request #3393 · whatwg/html () https://github.com/whatwg/html/pull/3393
[11] Give toDataURL() and toBlob() default parameter values (GloverDonovan著, ) https://github.com/whatwg/html/commit/b799322188cf33c7caef336bb27fe9223d995b24
[12] Give <canvas>'s toDataURL() and toBlob() default parameter values · Issue #3430 · whatwg/html () https://github.com/whatwg/html/issues/3430
[13] Give toDataURL() and toBlob() default parameter values by GloverDonovan · Pull Request #3477 · whatwg/html () https://github.com/whatwg/html/pull/3477