Alerts are displayed as yellow boxes overlaying the main TiddlyWiki window. Each one corresponds to a tiddler with the tag $:/tags/Alert. Clicking the delete icon on an alert deletes the corresponding tiddler.
Here's a demo .
Alert tiddlers should have the following fields:
|title||By default, alert titles have the prefix |
|text||The text of the alert message|
|modified||Date of the alert (used for ordering the alerts on screen)|
|component||Component name associated with the alert|
|tags||Must include $:/tags/Alert|