Describes the cause and action for error messages.
Error Message(English)：
text that does not print
Steven Poole: Goodbye, cruel Word
http://stevenpoole.net/blog/goodbye-cruel-word/
The Drop Cap - MS-Word Tutorial - SourceDaddy
https://sourcedaddy.com/ms-word/the-drop-cap.html
Microsoft Office/Create a Proposal with collaboration - Wikibooks ...
https://en.wikibooks.org/wiki/Microsoft_Office/Create_a_Proposal_with_collaboration
Adobe Acrobat Solutions - Experts Exchange
https://www.experts-exchange.com/topics/adobe-acrobat/solutions/?feedtpn=3