at-rule-no-vendor-prefix
Disallow vendor prefixes for at-rules.
    @-webkit-keyframes { 0% { top: 0; } }
/**  ↑
 * This prefix */The fix
option can automatically fix all of the problems reported by this
rule.
Options
true
The following patterns are considered violations:
@-webkit-keyframes { 0% { top: 0; } }@-ms-viewport { orientation: landscape; }The following patterns are not considered violations:
@keyframes { 0% { top: 0; } }@viewport { orientation: landscape; }