# value-no-vendor-prefix Disallow vendor prefixes for values. ```css a { display: -webkit-flex; } /** ↑ * These prefixes */ ``` This rule will only warn for prefixed *standard* values, and not for prefixed *proprietary* or *unknown* ones. ## Options ### `true` The following patterns are considered warnings: ```css a { display: -webkit-flex; } ``` ```css a { max-width: -moz-max-content; } ``` ```css a { background: -webkit-linear-gradient(bottom, #000, #fff); } ``` The following patterns are *not* considered warnings: ```css a { display: flex; } ``` ```css a { max-width: max-content; } ``` ```css a { background: linear-gradient(bottom, #000, #fff); } ```