The file examples.json is a JSON array of named examples. Each example consists of:

• a center lon,lat
• a zoom level
• a name that must be a simple slug e.g. null-island
• a description to explain the cartographic feature under test.
• an array of string tags that group examples e.g. buildings, national-parks

Required query parameters:

• ?left=abc123&right=61: The Artifact SHA or PR# to display on each side of the comparison.

Optional query parameters:

• ?name=null-island: run only the named example.
• ?tag=national-parks: run only one tag.
• ?showDifferencesOnly: run the tests, but only display where the pixels don't match.

The tile archive and named style layers are the only versioned artifacts. Non-versioned parts that affect the test run:

• The current examples.json
• The smalltestregion.osm.pbf covered areas and snapshot date from OSM.
• The maplibre-gl-js version.
• The font glyphs and sprite assets used by the style.