WebUSB is an API available in Chrome used for securely providing access to USB devices from web pages.
WebUSB can be used to connect Trezor Model T to Trezor Wallet. However, to ensure smooth communication, it is recommended to use Trezor Bridge instead. At the moment, WebUSB only works with the beta wallet.
For more information about connecting your Trezor device to Trezor Wallet, see Setting up Trezor with Trezor Wallet.