I'm currently trying to get a bit familiar with web bluetooth. For that, I tried to use https://googlechrome.github.io/samples/web-bluetooth/
On an Android 7 Phone I can perfectly find my BLE device with the "Device Info (Promises)" function.
But on any computer I tried this doesn't work. I tried it on a Windows 10, Ubuntu and Mac Computer. It fails on the dialog on which it searches devices. It doesn't find any devices and fails after some minutes with an error that it haven't found any devices.
Any idea what this is? Is this a general issue on this "new" technology?
The Implementation Status page lists more details, but a summary as of 2017-08-14:
chrome://flags/#enable-experimental-web-platform-features
internet://flags/#enable-web-bluetooth
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So, your Linux machine may need setup. Windows implementation is just not complete. And the macOS machine may not have BLE?