VTTRegion: viewportAnchorY property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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The viewportAnchorY property of the VTTRegion interface represents the y-coordinate of the viewport anchor, as a percentage of the video's height.
Value
A number, in the range 0 to 100 inclusive, representing the y-coordinate of the viewport anchor as a percentage of the video's height. The default is 100.
Exceptions
IndexSizeErrorDOMException-
Thrown when set to a value that is negative or greater than
100.
Examples
In the following example, a new VTTRegion is created, then the value of viewportAnchorY is set to 75. The value is then printed to the console.
js
const region = new VTTRegion();
region.viewportAnchorY = 75; // Place the region 75% from the top edge of the video
console.log(region.viewportAnchorY);
Specifications
| Specification |
|---|
| WebVTT: The Web Video Text Tracks Format # dom-vttregion-viewportanchory |