web api instance property
XRVisibilityMaskChangeEvent: index property
Secure contextLimited availability
The index read-only property of the XRVisibilityMaskChangeEvent interface indicates the index of the current XRView in the views array.
For a stereo view, there will be two views in the array. The index property allows you to identify the correct view to re-render, rather than having to re-render all views unnecessarily.
Value
A number.
Examples
This example indicates how you might render a display update for a particular XRView by querying the index value of the event object when a visibilitymaskchange event is fired.
xrSession.addEventListener("visibilitymaskchange", (e) => {
renderNewView(e.index);
});
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.