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Add allowance for system ui for safety #1344

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Sep 1, 2023
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Add allowance for system ui for safety #1344

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Expand Up @@ -495,6 +495,8 @@ In this document, the term <dfn>inline session</dfn> is synonymous with an {{inl

[=Immersive sessions=] MUST provide some level of [=viewer=] tracking, and content MUST be shown at the proper scale relative to the user and/or the surrounding environment. Additionally, [=Immersive sessions=] MUST be given <dfn>exclusive access</dfn> to the [=immersive XR device=], meaning that while the [=immersive session=] is {{XRVisibilityState/"visible"}} the HTML document is not shown on the [=immersive XR device=]'s display, nor does content from any other source have exclusive access. [=Exclusive access=] does not prevent the user agent from overlaying its own UI, however this UI SHOULD be minimal.

Note: UA may choose to overlay content for accessibility or safety such as guardian boundaries, obstructions or the user's hands when there are no alternative input sources.

Note: Future specifications or modules may expand the definition of [=immersive session=] to include additional session modes.

Note: Examples of ways [=exclusive access=] may be presented include stereo content displayed on a virtual reality headset.
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