Loading errors not always handled (Safari + Lockdown Mode)

[alxndrsn]

Expected Behaviour

When there is an error loading a form, this would be communicated to the user somehow.

Observed Behaviour

On iOS Safari with Lockdown Mode enabled, form loads perpetually.

Reproduction Steps

1. enable Lockdown Mode
2. browse to https://staging.getodk.cloud/projects/179/forms/SelectOneFromMapTestForm/preview?webforms=true

Screenshots or Videos

Environment

• Browser version: Safari
• OS: iOS 18.7.1
• Web Forms version: ?

Additional Context

It's unclear how/if it's possible to recreate this without an iOS device at the moment.

Filed microsoft/playwright#38094 in the hope that one day bugs like this can be caught earlier.

[alxndrsn]

This can be recreated by disabling WASM in WebKit.

There is a probably a missing error handler somewhere.

Stacktrace:

Error [ReferenceError]: Can't find variable: WebAssembly
@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:267:305892
Promise@[native code]
init@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:267:303160
init@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:271:7665
init@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:271:7790
init@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:271:8515
init@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:271:8541
module code@https://staging.getodk.cloud/assets/web-form-renderer-DfEQtcL9.js:271:8841