ChapterInformation: startTime 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.

The startTime read-only property of the ChapterInformation interface returns a number representing the start time of the chapter in seconds.

Value

A number.

See the main ChapterInformation page for an example.

Specification
Media Session # dom-chapterinformation-starttime

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`startTime` Experimental	Chrome – Full support Chrome 127 (Release date: 2024-07-23) footnote Full support	Edge – Full support Edge 127 (Release date: 2024-07-25) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 113 (Release date: 2024-08-22) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 127 (Release date: 2024-07-23) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 84 (Release date: 2024-08-26) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 28 (Release date: 2025-04-02) footnote Full support	WebView Android – Full support WebView Android 127 (Release date: 2024-07-23) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

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