| Virtual environment | YAML workflow label |
| --------------------|---------------------|
| Windows Server 2019 | `windows-latest` or `windows-2019` |
| Ubuntu 20.04 | `ubuntu-latest` (see note) or `ubuntu-20.04` |
| Ubuntu 18.04 | `ubuntu-latest` (see note) or `ubuntu-18.04` |
| Ubuntu 16.04 | `ubuntu-16.04` |
| macOS Big Sur 11.0 | `macos-11.0` |
| macOS Catalina 10.15 | `macos-latest` or `macos-10.15` |