Errata to the WebGL Specification
This page describes areas in the WebGL specification where known bugs in graphics drivers affect portability of code.
WebGL 2.0
macOS, AMD GPUs
Bugs in the implementation of transform feedback affect the ability to collect multiple draw calls' results into output buffers. The workaround is to use only a single draw call per transform feedback operation. Apple Radar 28126946, [| Chromium bug 526748]