Unity WebGL texel density

Hello everyone. Im working on commercial project based on Unity WebGL and there are big scenes of exhibition halls that i need to recreate. So i need to optimize everything, especially uv's, because it will impact on big lightmaps memory if it gonna be bad.
And my question is, do anyone know what texel density is for UnityWebGL? WebGL have his restrictions due to runing in browsers, so its not fully on GPU side, most of restrictions coming from browser. And its hard for me to figure out the texel density for the application, considering the fact im not well experienced in game development.