The partial_implementation data alone isn't very useful. We should consider requiring the notes property for any support statement that has partial_implementation: true. I started doing the schema work to do this, but it turned out there are more such cases than I would've guessed. At the moment, such support statements appear in the following features:

• api.CSS.supports
• api.Crypto.subtle
• api.GeometryUtils
• api.SubtleCrypto
• api.VisualViewport.onresize
• api.VisualViewport.onscroll
• api.VisualViewport.resize_event
• api.VisualViewport.scroll_event
• api.WindowOrWorkerGlobalScope.indexedDB
• css.properties.appearance
• css.properties.appearance.compat
• css.properties.filter
• css.properties.font-feature-settings
• css.properties.font-size.rem_values
• css.properties.text-decoration.shorthand
• html.elements.input.input-range
• html.elements.script.integrity
• html.elements.source.sizes
• html.elements.source.srcset
• webextensions.api.events.Event

Note: many of these features have more than support statement with a partial_implementation and no note.