ARButton only working in Safari on iOS

[sir-oliver]

Description

When clicking the ARButton on your iOS device using an alternative browser like Chrome, you get the message that AR is not supported, when in fact AR works fine if you place a direct link to an .usdz file. Is the detection of AR capability in isAvailable.ts not working correctly?

Steps to check or reproduce

Open the projects webpage https://woodneck.github.io/egjs-view3d/docs/ar on your iOS device with an alternative bowser (e.g. Chrome) and try the alarm clock demo at the end of the page. The ARButton outputs the message "AR is not supported in this browser"