TreeGrid expanded/collapsed status not announced by NVDA

[TatuLund]

What is the problem?

TreeGrid expanded/collapsed status is not announced by NVDA. This is because the "aria-expanded" attribute is set on tr-element, however this is not supported by NVDA, which requires the "aria-expanded" to be in the td-element's in order to be announced.

Browsers

• [X] Chrome
• [ ] Firefox
• [ ] Safari
• [ ] Safari on iOS
• [ ] Edge

Screen Readers

• [ ] None
• [X] NVDA
• [ ] JAWS
• [ ] VoiceOver on MacOS
• [ ] VoiceOver on iOS

[TatuLund]

Ideas of workaround with JavaScript call

grid.$.scroller.querySelectorAll("tr[aria-expanded='true']").forEach(tr => tr.children[0].setAttribute('aria-expanded','true'));

grid.$.scroller.querySelectorAll("tr[aria-expanded='false']").forEach(tr => tr.children[0].setAttribute('aria-expanded','false'));