@openstreetmap/id-tagging-schema/data/fields/incline_steps.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "incline",
    "type": "combo",
    "label": "{incline}",
    "strings": {
        "options": {
            "up": "Up",
            "down": "Down"
        }
    },
    "autoSuggestions": false,
    "customValues": false
}