Summarizer: format property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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 format read-only property of the Summarizer interface returns the text format summaries will be returned in.

Value

An enumerated value specifying the format of returned summaries. Possible values are:

markdown: Summaries contain markdown formatting (conforming to the CommonMark spec).
plain-text: Summaries contain no formatting.

const summarizer = await Summarizer.create({
  format: "plain-text",
  // ...
});

// Logs "plain-text"
console.log(summarizer.format);

Specification
Writing Assistance APIs # dom-summarizer-format

	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
`format` property 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

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