Editorial review: Document WebXR visibilitymaskchange event

[chrisdavidmills]

Description

Chrome 144 adds support for the visibilitymaskchange event/XRVisibilityMaskChange event object; see https://chromestatus.com/feature/5073760055066624.

This PR adds documentation for:

• The XRVisibilityMaskChange event object and all its members.
• The visibilitymaskchange event
• The XRView.index property.

Motivation

Additional details

Related issues and pull requests

[github-actions]

Preview URLs (11 pages)

• /en-US/docs/Web/API/XRSession/visibilitymaskchange_event
• /en-US/docs/Web/API/XRSession
• /en-US/docs/Web/API/XRView/index
• /en-US/docs/Web/API/XRView
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/XRVisibilityMaskChangeEvent
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/eye
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/index
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/indices
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/session
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/vertices
• /en-US/docs/Web/API/XRVisibilityMaskChangeEvent

Flaws (4)

Note! 8 documents with no flaws that don't need to be listed. 🎉

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/indices
Title: XRVisibilityMaskChangeEvent: indices property
Flaw count: 1

• macros:
  • Macro domxref produces link /en-US/docs/Web/API/Uint32Array which is a redirect

---

URL: /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/vertices
Title: XRVisibilityMaskChangeEvent: vertices property
Flaw count: 1

• macros:
  • Macro domxref produces link /en-US/docs/Web/API/Float32Array which is a redirect

---

URL: /en-US/docs/Web/API/XRVisibilityMaskChangeEvent/XRVisibilityMaskChangeEvent
Title: XRVisibilityMaskChangeEvent: XRVisibilityMaskChangeEvent() constructor
Flaw count: 2

• macros:
  • Macro domxref produces link /en-US/docs/Web/API/Uint32Array which is a redirect
  • Macro domxref produces link /en-US/docs/Web/API/Float32Array which is a redirect

External URLs (2)

URL: /en-US/docs/Web/API/XRSession/visibilitymaskchange_event
Title: XRSession: visibilitymaskchange event

• https://github.com/cabanier/three.js/blob/78a3227d95fc29e001d8cd139504c643987430c5/src/renderers/webxr/WebXRManager.js (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/API/XRVisibilityMaskChangeEvent
Title: XRVisibilityMaskChangeEvent

• https://github.com/cabanier/three.js/blob/78a3227d95fc29e001d8cd139504c643987430c5/src/renderers/webxr/WebXRManager.js (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-05-01 08:21:34)

[alcooper91]

NIT: This is a little confusing, I thought it was tracking some variable that the session had already ended at first glance/read through. maybe userRequestsSessionEnd and clear it in the block as well?

[chrisdavidmills]

That's a fair comment. I've updated the variable name throughout to userRequestsSessionEnd in my next commit.

[alcooper91]

Maybe also reference here that it's intended to be referenced into by the indices property.

[chrisdavidmills]

Sure, makes sense. I've added the following in a new paragraph:

The {{domxref("XRVisibilityMaskChangeEvent.indices", "indices")}} array specifies the indices of the vertices array that should be drawn to display the currently visible part of the scene displayed in the XRView.

[alcooper91]

LGTM