chromium/content/test/data/accessibility/html/form-validation-message-expected-blink.txt

rootWebArea
++alert containerLiveRelevant='additions' containerLiveStatus='assertive' name='Please enter pet name' liveRelevant='additions' liveStatus='assertive' containerLiveAtomic=true containerLiveBusy=false liveAtomic=true
++genericContainer ignored
++++genericContainer ignored
++++++sectionWithoutName
++++++++labelText
++++++++++staticText name='Pet name:'
++++++++++++inlineTextBox name='Pet name:'
++++++++textField required name='Pet name:' invalidState=true errorMessageIds=alert
++++++++++genericContainer