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Showing content from https://github.com/CSSLint/csslint/wiki/Rules below:

Rules · CSSLint/csslint Wiki · GitHub

The most important rule, as far as CSS Lint is concerned, is to ensure there are no parsing errors in the CSS. Parsing errors usually mean you mistyped a character and caused the code to become invalid CSS. These errors may cause the browser to drop a property or an entire rule. Parsing errors are always presented as errors by CSSLint, the most important issues to fix.

The following rules point out potential errors in your CSS.

• box-model: Beware of box model size
• display-property-grouping: Require properties appropriate for display
• duplicate-properties: Disallow duplicate properties
• empty-rules: Disallow empty rules
• known-properties: Require use of known properties

The following rules flag for compatibility problems across browsers and browser settings.

• adjoining-classes: Disallow adjoining classes
• box-sizing: Disallow box-sizing
• compatible-vendor-prefixes: Require compatible vendor prefixes
• gradients: Require all gradient definitions
• text-indent: Disallow negative text-indent
• vendor-prefix: Require standard property with vendor prefix
• fallback-colors: Require fallback colors
• star-property-hack: Disallow star hack
• underscore-property-hack: Disallow underscore hack
• bulletproof-font-face: Bulletproof font-face (new in v0.9.10)

The following rules are aimed at improving CSS performance, including runtime performance and overall code size.

• font-faces: Don't use too many web fonts
• import: Disallow @import
• regex-selectors: Disallow selectors that look like regular expressions
• universal-selector: Disallow universal selector
• unqualified-attributes: Disallow unqualified attribute selectors
• zero-units: Disallow units for zero values
• overqualified-elements: Disallow overqualified elements
• shorthand: Require shorthand properties
• duplicate-background-images: Disallow duplicate background images

These rules help to ensure your code is readable and maintainable by others.

• floats: Disallow too many floats
• font-sizes: Don't use too many font-size declarations
• ids: Disallow IDs in selectors
• important: Disallow !important
• order-alphabetical: Disallow non alphabetical

These rules are designed to pick out possible accessibility issues.

• outline-none: Disallow outline:none

These rules are based on the principles of OOCSS.

• qualified-headings: Disallow qualified headings
• unique-headings: Headings should only be defined once

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