[Web] WebGPU backend on Safari fails to initialise `TypeError: undefined is not an object (evaluating 'e.subgroupMinSize')`

[aleksanderkatan]

Describe the issue

I tracked the issue to device.adapterInfo being straight up undefined on Safari (Version 26.0.1 (20622.1.22.118.4)).
https://developer.mozilla.org/en-US/docs/Web/API/GPUDevice/adapterInfo

To reproduce

import * as ort from 'onnxruntime-web/webgpu';

const session = await ort.InferenceSession
  .create('/path/to/model/2netp.onnx', {
    executionProviders: ['webgpu'],
  });

Model I used is 2netp.onnx, https://github.com/danielgatis/rembg/releases/download/v0.0.0/u2netp.onnx

Urgency

It's not urgent.

ONNX Runtime Installation

Released Package

ONNX Runtime Version or Commit ID

1.23.0-dev.20250917-21fbad8a65

Execution Provider

'webgpu' (WebGPU)

[guschmue]

looking

[fs-eire]

Created a bug on webkit: https://bugs.webkit.org/show_bug.cgi?id=301878

[fs-eire]

It may not be very straightforward to polyfill device.adapterInfo because given a device object it is impossible to get its adapter object in web. So maybe need to modify the device object when created.

verified that the polyfill works on Safari v26.0.