declaration-block-no-redundant-longhand-properties

Disallow redundant longhand properties within declaration-block.

  a {
    padding-top: 1px;
    padding-right: 2px;
    padding-bottom: 3px;
    padding-left: 4px; }
/** ↑
 *  These longhand properties */

The longhand properties in the example above can be more concisely written as:

a {
  padding: 1px 2px 3px 4px;
}

This rule will only complain if you've used the longhand equivalent of all the properties that the shorthand will set and if their values are not CSS-wide keywords like initial, inherit etc.

This rule complains when the following shorthand properties can be used:

• animation
• background
• border
• border-block
• border-block-end
• border-block-start
• border-bottom
• border-color
• border-image
• border-inline
• border-inline-end
• border-inline-start
• border-left
• border-radius
• border-right
• border-style
• border-top
• border-width
• column-rule
• columns
• flex
• flex-flow
• font
• font-synthesis
• font-variant
• gap
• grid
• grid-area
• grid-column
• grid-gap
• grid-row
• grid-template
• inset
• inset-block
• inset-inline
• list-style
• margin
• margin-block
• margin-inline
• mask
• outline
• overflow
• overscroll-behavior
• padding
• padding-block
• padding-inline
• place-content
• place-items
• place-self
• scroll-margin
• scroll-margin-block
• scroll-margin-inline
• scroll-padding
• scroll-padding-block
• scroll-padding-inline
• text-decoration
• text-emphasis
• transition

注意

Please note that properties are considered to be redundant if they may be written shorthand according to the specification, regardless of the behavior of any individual browser. For example, due to Internet Explorer's implementation of Flexbox, it may not be possible to use the shorthand property flex, but the longhand form is still considered a problem.

Flexbox-related properties can be ignored using ignoreShorthands: ["/flex/"] (see below).

The fix option can automatically fix most of the problems reported by this rule.

The message secondary option can accept the arguments of this rule.

Options

true

The following patterns are considered problems:

a {
  margin-top: 1px;
  margin-right: 2px;
  margin-bottom: 3px;
  margin-left: 4px;
}

a {
  font-style: italic;
  font-variant: normal;
  font-weight: bold;
  font-stretch: normal;
  font-size: 14px;
  line-height: 1.2;
  font-family: serif;
}

a {
  -webkit-transition-property: top;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease;
  -webkit-transition-delay: 0.5s;
}

The following patterns are not considered problems:

a {
  margin: 1px 2px 3px 4px;
}

a {
  font: italic normal bold normal 14px/1.2 serif;
}

a {
  -webkit-transition: top 2s ease 0.5s;
}

a {
  margin-top: 1px;
  margin-right: 2px;
}

a {
  margin-top: 1px;
  margin-right: 2px;
  margin-bottom: 3px;
}

Optional secondary options

ignoreLonghands: ["array", "of", "properties"]

Given:

["text-decoration-thickness", "background-size", "background-origin", "background-clip"]

The following patterns are considered problems:

a {
  text-decoration-line: underline;
  text-decoration-style: solid;
  text-decoration-color: purple;
}

a {
  background-repeat: repeat;
  background-attachment: scroll;
  background-position: 0% 0%;
  background-color: transparent;
  background-image: none;
  background-size: contain;
  background-origin: border-box;
  background-clip: text;
}

The following patterns are not considered problems:

a {
  text-decoration: underline solid purple;
  text-decoration-thickness: 1px;
}

a {
  background: none 0% 0% repeat scroll transparent;
  background-size: contain;
  background-origin: border-box;
  background-clip: text;
}

ignoreShorthands: ["/regex/", /regex/, "string"]

Given:

["padding", "/border/"]

The following patterns are not considered problems:

a {
  padding-top: 20px;
  padding-right: 10px;
  padding-bottom: 30px;
  padding-left: 10px;
}

a {
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  border-right-width: 1px;
}

a {
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  border-right-width: 1px;
}

a {
  border-top-color: green;
  border-top-style: double;
  border-top-width: 7px;
}