Support for Vulkan on Windows is pretty extensive - AMD and Nvidia are retroactively supporting their hardware back to 2012, and Intel back to 2015, all of them

Support for Vulkan on Windows is pretty extensive - AMD and Nvidia are retroactively supporting their hardware back to 2012, and Intel back to 2015, all of them on Windows 7 and up. Considering the lengthy turn-around time for these APIs (WebGL 2.0 took four years to get from a draft spec to enabled in some browsers by default), any Windows machine that couldn't run WebVulkan would be rather long in the tooth by the time the standard sees any real world use.