--- /dev/null
+# selector-attribute-brackets-space-inside
+
+Require a single space or disallow whitespace on the inside of the brackets within attribute selectors.
+
+```css
+ [ target=_blank ]
+/** ↑ ↑
+ * The space inside these two brackets */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a single space inside the brackets.
+
+The following patterns are considered violations:
+
+```css
+[target] {}
+```
+
+```css
+[ target] {}
+```
+
+```css
+[target ] {}
+```
+
+```css
+[target=_blank] {}
+```
+
+```css
+[ target=_blank] {}
+```
+
+```css
+[target=_blank ] {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+[ target ] {}
+```
+
+```css
+[ target=_blank ] {}
+```
+
+### `"never"`
+
+There *must never* be whitespace on the inside the brackets.
+
+The following patterns are considered violations:
+
+```css
+[ target] {}
+```
+
+```css
+[target ] {}
+```
+
+```css
+[ target ] {}
+```
+
+```css
+[ target=_blank] {}
+```
+
+```css
+[target=_blank ] {}
+```
+
+```css
+[ target=_blank ] {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+[target] {}
+```
+
+```css
+[target=_blank] {}
+```