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Disallow shorthand properties that override related longhand properties.

a { background-repeat: repeat; background: green; }
/** ↑
* This overrides the longhand property before it */

In almost every case, this is just an authorial oversight. For more about this behavior, see MDN's documentation of shorthand properties.



The following patterns are considered problems:

a {
padding-left: 10px;
padding: 20px;
a {
transition-property: opacity;
transition: opacity 1s linear;
a {
-webkit-transition-property: opacity;
-webkit-transition: opacity 1s linear;
a {
border-top-width: 1px;
top: 0;
bottom: 3px;
border: 2px solid blue;

The following patterns are not considered problems:

a { padding: 10px; padding-left: 20px; }
a { transition-property: opacity; } a { transition: opacity 1s linear; }
a { transition-property: opacity; -webkit-transition: opacity 1s linear; }