--- /dev/null
+# selector-descendant-combinator-no-non-space
+
+Disallow non-space characters for descendant combinators of selectors.
+
+```css
+.foo .bar .baz {}
+/** ↑ ↑
+* These descendant combinators */
+```
+
+This rule ensures that only a single space is used and ensures no tabs, newlines, nor multiple spaces are used for descendant combinators of selectors.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+```css
+.foo .bar {}
+```
+
+```css
+.foo
+.bar {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+.foo .bar {}
+```