Bug 229916

Summary:	ARIAMixin properties should be non-nullable
Product:	WebKit	Reporter:	Kagami Sascha Rosylight <saschanaz>
Component:	Accessibility	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	andresg_22, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	All
OS:	All

Description Kagami Sascha Rosylight 2021-09-04 10:28:52 PDT

Context: https://github.com/w3c/aria/pull/1261

```
document.body.ariaAtomic
// this currently returns null but should always return a string
```

Comment 1 Radar WebKit Bug Importer 2021-09-04 10:29:08 PDT

<rdar://problem/82759865>