Function adapter_allowed 

fn adapter_allowed(
    flags: InstanceFlags,
    info: &impl Debug,
    limits: &Limits,
    downlevel: &DownlevelCapabilities,
) -> bool

This function checks that the adapter obeys WebGPU’s adapter capability guarantees. Most of the limits are adjusted in wgpu-hal’s adjust_raw_limits fn. So we only check the remaining properties here. See https://gpuweb.github.io/gpuweb/#adapter-capability-guarantees.