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
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: ["string"]
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;
}