--- /dev/null
+# media-feature-colon-space-after
+
+Require a single space or disallow whitespace after the colon in media features.
+
+```css
+@media (max-width: 600px) {}
+/** ↑
+ * The space after this colon */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a single space after the colon.
+
+The following patterns are considered violations:
+
+```css
+@media (max-width:600px) {}
+```
+
+```css
+@media (max-width :600px) {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+@media (max-width: 600px) {}
+```
+
+```css
+@media (max-width : 600px) {}
+```
+
+### `"never"`
+
+There *must never* be whitespace after the colon.
+
+The following patterns are considered violations:
+
+```css
+@media (max-width: 600px) {}
+```
+
+```css
+@media (max-width : 600px) {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+@media (max-width:600px) {}
+```
+
+```css
+@media (max-width :600px) {}
+```