There is an alert at the top of this page that will automatically be displayed 10 seconds after the page has loaded. If you are a screen reader user and are still reading the content of this paragraph at that time, you may or may not be interrupted by the screen reader in order to hear the important announcement. Whether you are interrupted depends on whether the aria-live role is set to "polite" or "assertive", as defined by the W3C WAI-ARIA Specification. Early versions of ARIA also included a value of "rude" which some screen readers may still support, although at this point it is no longer part of the specification. If you would like to experiment with various values related to aria-live, just use the following form to change the values, then press "Go" to reload the page. Additional explanation and test results are available at terrillthompson.com.