boundary

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The boundary event of the Web Speech API is fired when the spoken utterance reaches a word or sentence boundary.

Bubbles	No
Cancelable	No
Target objects	`SpeechSynthesisUtterance`
Interface	`SpeechSynthesisEvent`

Examples

utterThis.onboundary = function(event) {
  console.log(event.name + ' boundary reached after ' + event.elapsedTime + ' milliseconds.');
}

Inheritance

The boundary event implements the SpeechSynthesisEvent interface, which inherits from Event. It therefore has available the properties and methods defined on both these interfaces.

  <div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveAspectRatio="xMinYMin meet"><a xlink:href="https://developer.mozilla.org/en-US/docs/Web/API/Event" target="_top"><rect x="1" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="38.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Event</text></a><polyline points="76,25  86,20  86,30  76,25" stroke="#D4DDE4" fill="none"/><line x1="86" y1="25" x2="116" y2="25" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisEvent" target="_top"><rect x="116" y="1" width="200" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text  x="216" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">SpeechSynthesisEvent</text></a></svg></div>

  a:hover text { fill: #0095DD; pointer-events: all;}

Specifications

Specification	Status	Comment
Web Speech API The definition of 'speech synthesis utterance events' in that specification.	Draft

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	33	(Yes)	44 (44) ^[1]	No support	No support	No support

Feature	Android	Chrome	Edge	Firefox Mobile (Gecko)	Firefox OS	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	(Yes)	(Yes)	?	2.5	No support	No support	No support

[1] Can be enabled via the media.webspeech.synth.enabled flag in about:config.

Examples

Inheritance

Specifications

Browser compatibility

See also

Document Tags and Contributors