Chrome and Firefox felt there were sufficient problems with OpenGL driver availabity that they implemented WebGL using DirectX (via the ANGLE project), despite

Chrome and Firefox felt there were sufficient problems with OpenGL driver availabity that they implemented WebGL using DirectX (via the ANGLE project), despite the more obvious mapping to OpenGL. Is there any reason to believe that, unlike OpenGL, Vulkan drivers will be sufficiently widespread for browser vendors to use it on Windows?