Prevent page zoom on input focus in iOS 10. fixes flarum/core#1023

framework/core/less/lib/Form.less

@@ -18,6 +18,10 @@
     height: 50px;
     padding: 15px 20px;
     font-size: 15px;
+
+    @media @phone {
+      font-size: 16px; // minimum font-size required to prevent page zoom on focus in iOS 10
+    }
   }
 
   .Form-group {

framework/core/less/lib/FormControl.less

@@ -38,6 +38,10 @@
   textarea& {
     height: auto;
   }
+
+  @media @phone {
+    font-size: 16px; // minimum font-size required to prevent page zoom on focus in iOS 10
+  }
 }
 .helpText {
   font-size: 12px;