Bug 230408 – AX: iOS VoiceOver doesn't correctly announce expanded state of details element if summary has display: inline-block

• Component: Accessibility
• Status: NEW

[Oliver Byford]

Given a details element where the summary is set to `display: inline-block`:

```
<details>
  <summary style="display: inline-block;">Summary</summary>
  <p>Content</p>
</details>
```

1. Activate VoiceOver on iOS
2. Swipe to 'Summary'
3. Double tap to expand the details element
4. Swipe forwards to the expanded content
5. Swipe back to 'Summary'

Expected result:
In step 3, after expanding the element , VO should announce 'Summary, expanded'
In step 5, when swiping back to the summary, VO should announce 'Summary, expanded'

Actual result:
In step 3, after expanding the element , VO announces 'Summary, collapsed'
In step 5, when swiping back to the summary, VO announces 'Summary'

This issue does not occur if the summary element is set to `display: inline-block` or the user-agent default `display: list-item`.

[Radar WebKit Bug Importer]

<rdar://problem/83242798>

[Oliver Byford]

Created attachment 438478 [details]
Test case, with alternative versions for comparison

Adding an example test case, with versions using `display: block` and the user-agent default `display` for comparison.

[Curtis Wilcox]

Using iOS 17.1 with the attached test case, after double tapping the summary with inline-block, VoiceOver (VO) repeats the summary's name but doesn't announce the state ("expanded"). After swiping forward and then back, VO again announces only the name but not the state.

After double-tapping the summary with inline-block again, VO does announce both the name and the collapsed state and does so again if I swipe forward and then back.

VO always announces the name and state for the default `display` and `display: block` versions (before iOS 17.1, VO wasn't announcing *any* states for details/summary elements).