at-rule-blacklist
Deprecated: Instead use the at-rule-disallowed-list
rule.
Specify a list of disallowed at-rules.
    @keyframes name {}
/** ↑
 * At-rules like this */Options
array|string:
["array", "of", "unprefixed", "at-rules"]|"at-rule"
Given:
["extend", "keyframes"]
The following patterns are considered violations:
a { @extend placeholder; }@keyframes name {
  from { top: 10px; }
  to { top: 20px; }
}@-moz-keyframes name {
  from { top: 10px; }
  to { top: 20px; }
}The following patterns are not considered violations:
@import "path/to/file.css";