.markuplintrc

{
  "rules": {
    "attr-duplication": true,
    "attr-value-quotes": true,
    "case-sensitive-attr-name": true,
    "case-sensitive-tag-name": true,
    "character-reference": true,
    "deprecated-attr": true,
    "deprecated-element": true,
    "disallowed-element": [],
    "doctype": true,
    "end-tag": true,
    "id-duplication": true,
    "ineffective-attr": true,
    "invalid-attr": true,
    "label-has-control": true,
    "landmark-roles": {
      "options": {
        "ignoreRoles": ["complementary"]
      }
    },
    "no-boolean-attr-value": false,
    "no-default-value": true,
    "no-empty-palpable-content": true,
    "no-hard-code-id": true,
    "no-refer-to-non-existent-id": true,
    "no-use-event-handler-attr": true,
    "permitted-contents": true,
    "required-attr": true,
    "required-element": [],
    "required-h1": true,
    "use-list": [],
    "wai-aria": true
  },
  "nodeRules": [
    {
      "selector": "html",
      "rules": {
        "invalid-attr": {
          "options": {
            "ignoreAttrNamePrefix": [
              "prefix"
            ]
          }
        },
        "required-attr": [
          "lang"
        ]
      }
    },
    {
      "selector": "meta[property]",
      "rules": {
        "invalid-attr": {
          "options": {
            "allowAttrs": {
              "property": {
                "pattern": "/^og:.+/"
              },
              "content": {
                "type": "NoEmptyAny"
              }
            }
          }
        },
        "required-attr": false
      }
    }
  ]
}