iOS Beta 18.7.2, cannot get webgl2 context

[tristan-morris]

mapbox-gl-js version

No response

Browser and version

Safari, Chrome, Firefox on iOS Beta 18.7.2

Expected behavior

More of an fyi but incase it makes it into the final release: iOS Beta 18.7.2 somehow broke getting webgl2 (and webgl) contexts in Safari and other browers. And so mapbox-gl-js doesn't work.

const canvas = document.createElement('canvas');
const context = canvas.getContext('webgl2');

// Immediate [Error] WebGL: context lost.

This is at least handled by the mapboxgl.supported() check.

iOS 18.7.1 (release) and iOS 26 aren't impacted.

Actual behavior

No response

Link to the demonstration

No response

Steps to trigger the unexpected behavior

No response

Relevant log output

Edit - typo fix iOS 21 to 26

[nevets963]

We're also experiencing this. @tristan-morris Would you know already if a bug report has already been filed with Apple?

EDIT: I just tested iOS 26.0.1, and everything works fine
EDIT: I just submitted a bug report to Apple using their Feedback Assistant tool

[tristan-morris]

Just realised I typoed the iOS 21 which should be 26.

Yes, I did too via Feedback Assistant but it's rather opaque hey. Hopefully it's picked up in Radar!

[underoot]

Hello, I can confirm that 18.7.2 has an issue with the WebGL context in Safari. As it is not a stable release, it's expected that some bugs might appear. I think you should report feedback through the assistant tool, as you have already done. From our side, alongside of reporting the issue to the Apple team, we cannot do anything, unfortunately. We will monitor the situation and hope that the patch will be published soon.