USB-tethering to an iPhone for web access is in the works for Chromebooks. Why would you need this? It uses less battery on your device compared to Wi-Fi or Bluetooth tethering.
Browsing: Instant Tethering
Until today, you officially needed a Google-branded Android phone and Chromebook to use the Instant Tethering feature for connectivity when you can’t find a Wi-Fi hotspot. Now, the feature is expanding to partner devices with more in the coming months.
Originally only for Chromebook users with a Google Pixel phone, the Instant Tethering feature of Chrome OS now supports non-Pixel Android handsets in the Dev Channel. Here’s how to use it and which phones, so far, work with it.