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third_party/polymer/components/paper-icon-button/paper-icon-button.html

 <!--
 @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
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
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 -->
 
 <dom-module id="paper-icon-button">
   <template strip-whitespace>
     <style>
       :host {
         display: inline-block;
         position: relative;
         padding: 8px;
         outline: none;
-        -webkit-tap-highlight-color: rgba(0,0,0,0);
         -webkit-user-select: none;
         -moz-user-select: none;
         -ms-user-select: none;
         user-select: none;
         cursor: pointer;
         z-index: 0;
         line-height: 1;
 
         width: 40px;
         height: 40px;
 
+        /* NOTE: Both values are needed, since some phones require the value to be `transparent`. */
+        -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+        -webkit-tap-highlight-color: transparent;
+
         /* Because of polymer/2558, this style has lower specificity than * */
         box-sizing: border-box !important;
 
         @apply(--paper-icon-button);
       }
 
       :host #ink {
         color: var(--paper-icon-button-ink-color, --primary-text-color);
         opacity: 0.6;
       }
@@ skipping 63 matching lines @@
         var label = this.getAttribute('aria-label');
 
         // Don't stomp over a user-set aria-label.
         if (!label || oldValue == label) {
           this.setAttribute('aria-label', newValue);
         }
       }
     });
   </script>
 </dom-module>