I have used Loader style nothing.
Why is these loader icon showing up in Html 5 export (Normal Style).
The icons 16 to 256 are actually the icons displayed in the URL bar/on mobile (favicon). Nothing to see with the loader.
Only the loading-logo.png is, And I guess it is just exported with the project anyway, whatever the Loader style property is.
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Various platforms use the icons for various purposes. Ordinary HTML5 exports use them as icons in the app.manifest file, so if you 'add to home screen' it should show those icons. Think of them as the app icon as opposed to a loading icon.