declaration-block-no-redundant-longhand-properties

Disallow longhand properties that can be combined into one shorthand property.

  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.

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

margin
padding
background
font
border
border-top
border-bottom
border-left
border-right
border-width
border-style
border-color
list-style
border-radius
transition
animation
border-block-end
border-block-start
border-image
border-inline-end
border-inline-start
column-rule
columns
flex
flex-flow
grid
grid-area
grid-column
grid-gap
grid-row
grid-template
outline
text-decoration
text-emphasis
mask

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 violation.

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

Options

`true`

The following patterns are considered violations:

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 violations:

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

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

Given:

["padding", "/border/"]

The following patterns are not considered violations:

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;
}