Version: Chrome 61.
When refreshing a google doc, JAWS/NVDA will read the title of the page 
twice, then say "frame, document content edit, screenreader support 
enabled. On page 1." In Chrome, (dev; 61) JAWS says "frame read only, 
frame read only. Edit. read only. Edit. Frame read only. About blank 
window Document content editable." or something like that. Sometimes it 
will even read the URL. NVDA doesn't do this but it has many more 
duplicate alerts: after reading the title, it says "Application. 
Application. Document editable. Document content editable. Application. 
Document content editable. multiline. You are online. About blank. 
Screenreader mode enabled. Screenreader mode enabled. On page one. 
Screenreader mode enabled." Or some combination of the above. If the doc 
has suggestion mode this alert will also repeat.