Added examples

src/plugins/input/readme.md

@@ -1,6 +1,6 @@
 ## Input
 
-Simple (or not) text form elements:
+Simple text form elements, here formatted with the grid system:
 
 ```html
 <fieldset class="flex two">
@@ -15,3 +15,15 @@ input.demo {
   margin-bottom: .3em;
 }
 </style>
+
+### Elements
+
+The style applies to `<input>` (of any type), `<textarea>` and `<select>` like `<div class="select"><select>...`:
+
+```html
+<fieldset class="flex two">
+  <label><input type="email" placeholder="Email"></label>
+  <label class="select"><select><option>A</option><option>B</option></select></label>
+</fieldset>
+<textarea placeholder="Textarea"></textarea>
+```