# stylus/at-rule-no-unknown
disallow unknown at-rules.
- ⚙️ This rule is included in
"stylelint-plugin-stylus/recommended"and"stylelint-plugin-stylus/standard". (options:true)
# 📖 Rule Details
This rule reports other than at-rules defined in the CSS specification and at-rules available in the Stylus standard.
# ❓ Why Not Use stylelint Rule
The at-rule-no-unknown (opens new window) rule incorrectly report errors in Stylus.
This problem is that the core rules do not understand at-rules of the Stylus.
The stylus/at-rule-no-unknown rule understands at-rules of the Stylus.
# 🔧 Options
See stylelint - at-rule-no-unknown - Options (opens new window).
# true
// ✓ GOOD
@media (max-width: 960px) {}
@media (max-width: 960px)
.foo
color red
@import "reset.css"
@css {
.foo {}
}
.foo
@extend .bar
// ✗ BAD
@unknown {}
@unknown "foo";
@unknown
.foo
color red