Wcag user notification

1. Who benefits if the error message is shown next to the user input field and notified to screen reader?
2. What are WCAG 2.0 guidelines?

Who benefits if the error message is shown next to the user input field and notified to screen reader?

3.3. 3 Error Suggestion: If an input error is automatically detected and suggestions for correction are known, then the suggestions are provided to the user, unless it would jeopardize the security or purpose of the content.

What are WCAG 2.0 guidelines?

WCAG 2.0 refers to Web Content Accessibility Guidelines, which are published by the World Wide Web Consortium's (W3C) Web Accessibility Initiative (WAI). The Web Content Accessibility Guidelines (WCAG) 2.0 provide recommendations for making Web content more accessible.