noImportantInKeyframe

Diagnostic Category: lint/suspicious/noImportantInKeyframe

CSS

Since: v1.8.0

Note

• This rule is recommended by Biome. A diagnostic error will appear when linting your code.

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

Section titled Examples

Invalid

Section titled Invalid

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

code-block.css:6:18 lint/suspicious/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

Section titled Valid

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

Related links

Section titled Related links

• Disable a rule
• Configure the rule fix
• Rule options