screenshot-page: add implicit `<label>`, `<radio>`

Resolves #41.

screenshot-page.html

@@ -49,10 +49,44 @@
           </div>
 
           <div>
-            <input type='checkbox' name='remember' id='remember' checked>
+            <input type='checkbox' name='remember' id='remember'>
             <label for='remember'>Remember me</label>
           </div>
 
+          <div>
+            <label>
+              <input type='checkbox' name='in-label' id='in-label' checked>
+              Is this checkbox inside a <code>&lt;label&gt;</code> element?
+            </label>
+          </div>
+
+          <div>
+            <fieldset>
+              <legend>Choose a cardinal direction:</legend>
+
+              <div>
+                <input type='radio' id='north' name='direction' value='north' checked>
+                <label for='north'>North</label>
+              </div>
+
+              <div>
+                <input type='radio' id='east' name='direction' value='east'>
+                <label for='east'>East</label>
+              </div>
+
+              <div>
+                <input type='radio' id='south' name='direction' value='south'>
+                <label for='south'>South</label>
+              </div>
+
+              <div>
+                <input type='radio' id='west' name='direction' value='west'>
+                <label for='west'>West</label>
+              </div>
+
+            </fieldset>
+          </div>
+
           <input type='submit'>
         </form>