# What concrete caption, audio-cue and locomotion-alternative guidance do Meta Horizon OS and Apple visionOS publish, and how do their precision and status differ from XAUR?

- id: art_01M5MDPYMAZY9CXK9Q71MN1DS4
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T18, T19 · tags: none
- updated: 2026-10-23T13:02:56.624Z
- url: https://veyrul.com/articles/art_01M5MDPYMAZY9CXK9Q71MN1DS4

Only Meta gives numeric caption parameters (about 1 m start, ~0.5 s roll-up, 32 characters x 2 rows, at most 4 speakers) and labels them evolving and non-blocking; Apple and XAUR stay at principle level; none cites measurements. Meta's optional head-leashed captions vs Apple's advice not to anchor content to the head is kept as a platform difference.

Only Meta gives numeric caption parameters (about 1 m start, ~0.5 s roll-up, 32 characters x 2 rows, at most 4 speakers) and labels them evolving and non-blocking; Apple and XAUR stay at principle level; none cites measurements. Meta's optional head-leashed captions vs Apple's advice not to anchor content to the head is kept as a platform difference.

Curator qualifications: Documentation read 2026-10-22; no engine, exporter or headset run; behaviour not observed. Meta pages are dynamic; live bytes differ from the producer pins (content re-verified). No study behind the numeric values.

Limitations: Documentation read 2026-10-22; no engine, exporter or headset run; behaviour not observed.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://www.w3.org/TR/xaur",
      "note": "Meta Horizon accessibility design page (live bytes differ from producer pin; dynamic page); Meta Horizon accessibility checklist (live bytes differ from pin); Apple HIG accessibility JSON (bytes equal producer pin)"
    },
    {
      "url": "https://developer.apple.com/design/human-interface-guidelines/accessibility",
      "note": "Meta Horizon accessibility design page (live bytes differ from producer pin; dynamic page); Meta Horizon accessibility checklist (live bytes differ from pin); Apple HIG accessibility JSON (bytes equal producer pin)"
    },
    {
      "url": "https://developers.meta.com/horizon/design/accessibility/",
      "note": "Meta Horizon accessibility design page (live bytes differ from producer pin; dynamic page); Meta Horizon accessibility checklist (live bytes differ from pin); Apple HIG accessibility JSON (bytes equal producer pin)"
    },
    {
      "url": "https://developers.meta.com/horizon/design/accessibility-checklist/",
      "note": "Meta Horizon accessibility design page (live bytes differ from producer pin; dynamic page); Meta Horizon accessibility checklist (live bytes differ from pin); Apple HIG accessibility JSON (bytes equal producer pin)"
    },
    {
      "url": "https://www.w3.org/TR/2021/NOTE-xaur-20210825/",
      "note": "observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Only Meta gives numeric caption parameters (about 1 m start, ~0.5 s roll-up, 32 characters x 2 rows, at most 4 speakers) and labels them evolving and non-blocking; Apple and XAUR stay at principle level; none cites measurements. Meta's optional head-leashed captions vs Apple's advice not to anchor content to the head is kept as a platform difference. · locator: Meta Horizon accessibility design page (live bytes differ from producer pin; dynamic page); Meta Horizon accessibility checklist (live bytes differ from pin); Apple HIG accessibility JSON (bytes equal producer pin) · source: https://www.w3.org/TR/xaur

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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