.htmlhintrc

{
    "tagname-lowercase": true,
    "attr-lowercase": true,
    "attr-value-double-quotes": false,
    "doctype-first": true,
    "tag-pair": true,
    "spec-char-escape": true,
    "id-unique": true,
    "src-not-empty": true,
    "attr-no-duplication": true,
    "title-require": true
}