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HTML Event Attributes
The onstorageevent is a key component of the Web Storage API, designed to detect changes made to the localStorageor sessionStorageobjects. This event is triggered whenever a storageitem is modified, added, or deleted in one browser windowor tab and is visible to other windows or tabs of the same origin. It enables real-time synchronization of data across multiple browser contexts.
Window Event Attributes
| Attributes | Description |
|---|---|
| onafterprint | Fires after the document has started printing or the print dialog box has been closed. |
| onbeforeprint | Fires before the document is about to be printed. |
| onbeforeunload | Fires when the document is about to be unloaded. |
| onerror | Fires when an error occurs during loading of an external file (e.g., images or scripts). |
| onhashchange | Fires when the anchor part of the URL has changed. |
| onload | Fires when the page has finished loading. |
| onmessage | Fires when a message is received through an event source (e.g., WebSocket or iframe). |
| onoffline | Fires when the browser starts working offline. |
| ononline | Fires when the browser starts working online. |
| onpagehide | Fires when the user navigates away from a webpage. |
| onpageshow | Fires when the user navigates to a webpage. |
| onpopstate | Fires when the active history entry changes (e.g., when the user clicks the back or forward button). |
| onresize | Fires when the browser window is resized. |
| onstorage | Fires when a Web Storage area is updated (e.g., localStorage or sessionStorage). |
| onunload | Fires once a page is unloaded (or the browser window is closed). |
| HTML Attributes | Global Attributes | Event Attributes |
|---|---|---|
| To view the full list | To view the full list | To view the full list |
| elements |  |  |  |  |  |
|---|---|---|---|---|---|
| onstorage | Yes | Yes | Yes | Yes | Yes |
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