Intl.v8BreakIterator is a v8 only JavaScript API launched long ago before ECMA402 include the Intl.Segmenter. Since Intl.Segmenter is already shipped in m87 (https://chromestatus.com/feature/6099397733515264 ) , we should now deprecate and then remove BreakIterator from v8. The current stats of the usage The BreakIterator usage overall - https://chromestatus.com/metrics/feature/timeline/popularity/556 The Line type usage https://chromestatus.com/metrics/feature/timeline/popularity/3177 The Word type usage https://chromestatus.com/metrics/feature/timeline/popularity/3176