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Public-images-osm logo.svg footway = both
Forbidden Symbol Transparent.svg
Invalid tag/value combination; do not use Show/edit corresponding data item.
Group: Highways
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Status: deprecated

The tag footway=both is no longer in use. It was erroneously used a instead of sidewalk=both.