Should loading and error messages trap focus?

[seanredmond]

Yes, but you have to be careful about it. Here are some articles that discuss the issues:

• https://www.marcozehe.de/2015/02/05/advanced-aria-tip-2-accessible-modal-dialogs/
• http://blog.barrierbreak.com/2017/02/14/modal-dialogs-and-accessibility-a-tricky-minefield/