.csslintrc

[
    // Be careful when using !important declaration
    "important",

    // Don't use adjoining classes.
    "adjoining-classes",

    // Properties should be known (listed in CSS specification) or be a vendor-prefixed property.
    "known-properties",

    // The box-sizing properties isn't supported in IE6 and IE7.
    "box-sizing",

    // Don't use width or height when using padding or border.
    // "box-model",

    // Use of outline: none or outline: 0 should be limited to :focus rules.
    "outline-none",

    // Every background-image should be unique. Use a common class for e.g. sprites.
    "duplicate-background-images",

    // Include all compatible vendor prefixes to reach a wider range of users.
    "compatible-vendor-prefixes",

    // Certain properties shouldn't be used with certain display property values.
    "display-property-grouping",

    // Headings should not be qualified (namespaced).
    "qualified-headings",

    // For older browsers that don't support RGBA, HSL, or HSLA, provide a fallback color.
    "fallback-colors",

    // Duplicate properties must appear one after the other.
    "duplicate-properties",

    // Rules without any properties specified should be removed.
    "empty-rules",

    // This rule looks for recoverable syntax errors.
    "errors",

    // Use shorthand properties where possible.
    "shorthand",

    // Selectors should not contain IDs.
    "ids",

    // When using a vendor-prefixed gradient, make sure to use them all.
    "gradients",

    // Checks the number of font-size declarations.
    "font-sizes",

    // Too many different web fonts in the same stylesheet.
    "font-faces",

    // This rule tests if the float property is used too many times
    "floats",

    // Checks for the underscore property hack (targets IE6)
    "underscore-property-hack",

    // Don't use classes or IDs with elements (a.foo or a#foo).
    "overqualified-elements",

    // Don't use @import, use <link> instead.
    "import",

    // Selectors that look like regular expressions are slow and should be avoided.
    "regex-selectors",

    // Track how many rules there are.
    "rules-count",

    // Checks for the star property hack (targets IE6/7)
    "star-property-hack",

    // Checks for text indent less than -99px
    "text-indent",

    // Headings should be defined only once.
    "unique-headings",

    // The universal selector (*) is known to be slow.
    "universal-selector",

    // Unqualified attribute selectors are known to be slow.
    "unqualified-attributes",

    // When using a vendor-prefixed property, make sure to include the standard one.
    "vendor-prefix",

    // You don't need to specify units when a value is 0.
    "zero-units"
]