--- /dev/null
+# shorthand-property-no-redundant-values
+
+Disallow redundant values in shorthand properties.
+
+```css
+a { margin: 1px 1px 1px 1px; }
+/** ↑ ↑ ↑
+ * These values */
+```
+
+This rule alerts you when you use redundant values in the following shorthand properties:
+
+- `margin`
+- `padding`
+- `border-color`
+- `border-radius`
+- `border-style`
+- `border-width`
+- `grid-gap`
+
+The `--fix` option on the [command line](../../../docs/user-guide/cli.md#autofixing-errors) can automatically fix all of the problems reported by this rule.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+```css
+a { margin: 1px 1px; }
+```
+
+```css
+a { margin: 1px 1px 1px 1px; }
+```
+
+```css
+a { padding: 1px 2px 1px; }
+```
+
+```css
+a { border-radius: 1px 2px 1px 2px; }
+```
+
+```css
+a { -webkit-border-radius: 1px 1px 1px 1px; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { margin: 1px; }
+```
+
+```css
+a { margin: 1px 1px 1px 2px; }
+```
+
+```css
+a { padding: 1px 1em 1pt 1pc; }
+```
+
+```css
+a { border-radius: 10px / 5px; }
+```