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third_party/polymer/components/paper-input/demo/ssn-input.html

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 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
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 <link rel="import" href="../../polymer/polymer.html">
 <link rel="import" href="../../iron-input/iron-input.html">
 <link rel="import" href="../../iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="ssn-validator.html">
 
 <dom-module id="ssn-input">
   <template>
 
     <style>
       :host {
         display: inline-block;
       }
 
+      :host([hidden]) {
+        display: none !important;
+      }
+
       input[is="iron-input"] {
         font: inherit;
         outline: none;
         box-shadow: none;
         border: none;
         width: auto;
         text-align: center;
       }
 
       .container {
@@ skipping 50 matching lines @@
 
     observers: [
       '_computeValue(_ssn1,_ssn2,_ssn3)'
     ],
 
     _computeValue: function(ssn1, ssn2, ssn3) {
       this.value = ssn1.trim() + '-' + ssn2.trim() + '-' + ssn3.trim();
     }
   });
 </script>