Voicing with Safari only works in one iframe in Multi wrapper

[Nancy-Salpepi]

Test device
MacBook Air (m1 chip)

Operating System
12.3

Browser
Safari

Problem description
For phetsims/qa#791
The voicing feature only works in the second iframe. It doesn't work in the first one.

This issue was not seen in mac + chrome or on Win10 + Firefox.

Steps to reproduce

1. Turn on voicing in the preferences menu--It will say Voicing on
2. Press or move anything else--no voicing is heard

Visuals

voicingMulti.mov

[KatieWoe]

I'm also noticing that it doesn't work in State on the top iframe on iPad either. I'm seeing this in the multi wrapper on that device too, so it may be due to multiple iframes on a page.

[zepumph]

@jessegreenberg and I couldn't reproduce this issue in 15 minutes on a mac 11.6 + safari 15.2. We feel ready to close given our current level of support for voicing + phet-io. Thanks for the report.

[Nancy-Salpepi]

For phetsims/qa#868
Noting that I still see issues with Voicing working in multiple iframes with Multi and State wrappers. I am on macOS 13.0.1 and safari 16.1.

EDIT: Should this be added to the list of a11y bugs?