interface—part of the API for handling WebVTT (text tracks on media presentations)—describes a portion of the video to render a
DOMStringthat identifies the region.
doublerepresenting the width of the region, as a percentage of the video.
doublerepresenting the height of the region, in number of lines.
doublerepresenting the region anchor X offset, as a percentage of the region.
doublerepresenting the region anchor Y offset, as a percentage of the region.
doublerepresenting the viewport anchor X offset, as a percentage of the video.
doublerepresenting the viewport anchor Y offset, as a percentage of the video.
var region = new VTTRegion(); region.width = 50; // Use 50% of the video width region.lines = 4; // Use 4 lines of height. region.viewportAnchorX = 25; // Have the region start at 25% from the left. var cue = new VTTCue(2, 3, 'Cool text to be displayed'); cue.region = region; // This cue will be drawn only within this region.
|WebVTT: The Web Video Text Tracks Format||候选推荐|
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