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noImportantInKeyframe (since v1.8.0)

Diagnostic Category: lint/nursery/noImportantInKeyframe

Sources:

Same as: stylelint/keyframe-declaration-no-important

Disallow invalid !important within keyframe declarations

Using !important within keyframes declarations is completely ignored in some browsers.

Examples

Invalid

@keyframes foo {
    from {
      opacity: 0;
    }
    to {
      opacity: 1 !important;
    }
}

code-block.css:6:18 lint/nursery/noImportantInKeyframe ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Using !important within keyframes declaration is completely ignored in some browsers.
  
    4 │     }
    5 │     to {
  > 6 │       opacity: 1 !important;
      │                  ^^^^^^^^^^
    7 │     }
    8 │ }
  
  ℹ Consider removing useless !important declaration.

Valid

@keyframes foo {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
}