iosSrc property

The url to a USDZ model which will be used on supported iOS 12+ devices via AR Quick Look on Safari. The presence of this attribute will automatically enable the quick-look ar-mode, however it is no longer necessary. If instead the quick-look ar-mode is specified and ios-src is not specified, then we will generate a USDZ on the fly when the AR button is pressed. This means modifications via the scene-graph API will now be reflected in Quick Look. Hoowever, USDZ generation is not perfect, for instance animations are not yet supported, so in some cases supplying ios-src may give better results.

<model-viewer> official document: https://modelviewer.dev/docs/#entrydocs-augmentedreality-attributes-iosSrc