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Summarizer: length 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 length read-only property of the Summarizer interface returns the relative length of the generated summaries.

An enumerated value specifying the relative length of the generated summaries, the exact nature of which depends on the Summarizer type value.

Possible values are:

A "short" summary

For type tldr and teaser, the summary should fit into one sentence.
For type key-points, the summary should be no more than three bullet points.
For type headline, the summary should be no more than 12 words.

A "medium" summary

For type tldr and teaser, the summary should fit into one short paragraph.
For type key-points, the summary should be no more than five bullet points.
For type headline, the summary should be no more than 17 words.

A "long" summary

For type tldr and teaser, the summary should fit into one paragraph.
For type key-points, the summary should be no more than seven bullet points.
For type headline, the summary should be no more than 22 words.

const summarizer = await Summarizer.create({
  length: "medium",
  // ...
});

// Logs "medium"
console.log(summarizer.length);

Specification
Writing Assistance APIs> # dom-summarizer-length>

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS
`length`	138 Availability may be subject to geographical restrictions.	138	No	122 Availability may be subject to geographical restrictions.	No	No	No	No	No	No	No	No