Alerts - Critical Messages

Figure 1 Example of critical message alert

A critical message alert is a type of notification that is used to immediately inform users of urgent and important messages. It is used to communicate important information such as errors or warnings that require immediate attention.


  • New to accessibility or uncertain of requirements, it will be helpful to review all sections below.
  • Already familiar with requirements, skip to the “Working Example” section for sample HTML, CSS and JavaScript (when needed), along with a working demo.