Terence Eden on Nostr: Here's a knotty #HTML / #JavaScript problem. Is there any way of detecting whether ...

Here's a knotty #HTML / #JavaScript problem.

Is there any way of detecting whether the user-agent is capable of placing a telephone call?

There are some proxies - detecting the OS, or seeing if it a touchscreen, or detecting the NetworkInformation.type. But those are all fairly unreliable.

Is it possible to determine if a device is capable of using <a href="tel:...."> links?