node_modules/axe-core/lib/rules/valid-lang.json

{
	"id": "valid-lang",
	"selector": "[lang], [xml\\:lang]",
	"matches": "not-html-matches",
	"tags": ["cat.language", "wcag2aa", "wcag312"],
	"metadata": {
		"description": "Ensures lang attributes have valid values",
		"help": "lang attribute must have a valid value"
	},
	"all": [],
	"any": [],
	"none": ["valid-lang"]
}