Постоянная INVALID_FRAMEBUFFER_OPERATION
Реализация
static const int INVALID_FRAMEBUFFER_OPERATION = 0x0506;
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Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-web_gl/WebGL/INVALID_FRAMEBUFFER_OPERATION-constant.html
