sanitize-html has incomplete URI scheme validation in that allows javascript: URIs through action, formaction, data, poster, and background attributes

Summary sanitize-html uses allowedSchemesAppliedToAttributes default: 'href', 'src', 'cite' to gate the naughtyHref function that blocks dangerous URI schemes like javascript: and vbscript:. The HTML specification defines 10+ attributes that accept URIs action, formaction, data, poster, backgroun...