Allow placeholder attributes for input fields

program/include/html.php

@@ -318,8 +318,8 @@ class html_inputfield extends html
     protected $tagname = 'input';
     protected $type = 'text';
     protected $allowed = array('type','name','value','size','tabindex',
-	'autocomplete','checked','onchange','onclick','disabled','readonly',
+        'autocomplete','checked','onchange','onclick','disabled','readonly',
-	'spellcheck','results','maxlength','src','multiple');
+        'spellcheck','results','maxlength','src','multiple','placeholder');
 
     /**
      * Object constructor