This repository contains location based ar samples by Three.js and A-Frame. These use AR.js. I've only tried it on an iPhone, but it seems that the samples that add content later, including the official AR.js ones, don't work.
Sample model from here.
Demo:
Sample by Three.js- Sample1 by A-Frame
- Sample2 by A-Frame (official)
- Sample3 by A-Frame (Need to specify longitude and latitude on html)
Reference:
MIT