.htmlhintrc

{
    "tagname-lowercase": [
        "clipPath",
        "linearGradient"
    ],
    "attr-lowercase": [
        "viewBox",
        "preserveAspectRatio",
        "linearGradient",
        "gradientTransform",
        "gradientUnits"
    ],
    "attr-value-double-quotes": true,
    "attr-value-not-empty": false,
    "attr-no-duplication": true,
    "doctype-first": true,
    "tag-pair": true,
    "tag-self-close": true,
    "spec-char-escape": true,
    "id-unique": true,
    "src-not-empty": true,
    "title-require": false,
    "alt-require": true,
    "doctype-html5": true,
    "id-class-value": "dash",
    "style-disabled": true,
    "inline-style-disabled": true,
    "inline-script-disabled": true,
    "space-tab-mixed-disabled": "tab",
    "id-class-ad-disabled": false,
    "href-abs-or-rel": false,
    "attr-unsafe-chars": true,
    "head-script-disabled": false
}