CreateMonitor: downloadprogress event

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The downloadprogress event of the CreateMonitor interface is fired when progress is made on the AI model download.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("downloadprogress", (event) => { })

ondownloadprogress = (event) => { }

Event type

A ProgressEvent. Inherits from Event.

Event ProgressEvent

Examples

See the main CreateMonitor page for an example.

Specifications

Specification
Writing Assistance APIs
# dom-createmonitor-ondownloadprogress

Browser compatibility

desktop mobile server
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
downloadprogress event
Experimental
Chrome – Full support
Chrome 138 (Release date: 2025-06-24)
footnote
footnote Availability may be subject to geographical restrictions.
Edge – No support
Edge 138 (Release date: 2025-06-26)
disabled
disabled From version 138 users must explicitly set the #edge-llm-summarization-api-for-phi-mini preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 122 (Release date: 2025-09-11)
footnote
footnote Availability may be subject to geographical restrictions.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android
footnote No support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
Deno – No support
Deno
footnote No support
Node.js – No support
Node.js
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.

See also