The new PMTiles viewer also loads arbitrary TileJSON, not just PMTiles!

Here's a visualization of OSMF-hosted vector tiles at vector.openstreetmap.org:

pmtiles.io/#url=https%3A%2F%2F

And here's how you can drill down into a single tile like 3/4/2:

pmtiles.io/tile/#zxy=3/4/2&url

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