model element accessibility requirements

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model element accessibility requirements

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<model> fallback content could be based on <video> fallback content allowing use of track alternatives like captions and text-based audio descriptions (or potentially an new vtt-based metadata variant that could delineate time-based accessibility metadata)... Some examples are called out in the explainer: https://github.com/immersive-web/model-element/blob/main/explainer.md#fallback-content

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Simple "alt" text... When the model is used like an image.

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A way to indicate that the model contains its own accessibility metadata... e.g. "don't look here in the DOM for the accessibility, instead look in the model file."

This might also be useful for remotely loaded images (SVG>title or EXIF Description from raster image formats) or other include-type elements.

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Related USD Announcements: (cc @zachernuk @dgovil)

• https://aousd.org/blog/announcing-openusd-v25-05-key-features-and-improvements/
• https://openusd.org/dev/api/class_usd_u_i_accessibility_a_p_i.html