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third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu-light.html

 <!--
 @license
 Copyright (c) 2016 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
 -->
 
@@ skipping 80 matching lines @@
 
 @group Paper Elements
 @element paper-dropdown-menu-light
 @hero hero.svg
 @demo demo/index.html
 -->
 
 <dom-module id="paper-dropdown-menu-light">
   <template>
     <style include="paper-dropdown-menu-shared-styles">
+      :host(:focus) {
+        outline: none;
+      }
+
       /**
        * All of these styles below are for styling the fake-input display
        */
       .dropdown-trigger {
         box-sizing: border-box;
         position: relative;
         width: 100%;
         padding: 16px 0 8px 0;
       }
 
@@ skipping 84 matching lines @@
       :host([invalid]) label.label-is-floating {
         color: var(--paper-dropdown-error-color, --error-color);
       }
 
       /**
        * Sets up the focused underline. It's initially hidden, and becomes
        * visible when it's focused.
        */
       label:after {
         background-color: var(--paper-dropdown-menu-focus-color, --primary-color);
-        bottom: 8px;    /* The container has an 8px bottom padding */
+        bottom: 7px;    /* The container has an 8px bottom padding */
         content: '';
         height: 2px;
         left: 45%;
         position: absolute;
         transition-duration: .2s;
         transition-timing-function: cubic-bezier(.4,0,.2,1);
         visibility: hidden;
         width: 8px;
         z-index: 10;
       }
 
       :host([invalid]) label:after {
         background-color: var(--paper-dropdown-error-color, --error-color);
       }
 
       :host([no-label-float]) label:after {
-        bottom: 8px;    /* The container has a 8px bottom padding */
+        bottom: 7px;    /* The container has a 8px bottom padding */
       }
 
       :host([focused]:not([disabled])) label:after {
         left: 0;
         visibility: visible;
         width: 100%;
       }
 
       iron-icon {
         position: absolute;
@@ skipping 184 matching lines @@
         listeners: {
           'tap': '_onTap'
         },
 
         keyBindings: {
           'up down': 'open',
           'esc': 'close'
         },
 
         hostAttributes: {
+          tabindex: 0,
           role: 'combobox',
           'aria-autocomplete': 'none',
           'aria-haspopup': 'true'
         },
 
         observers: [
           '_selectedItemChanged(selectedItem)'
         ],
 
         attached: function() {
@@ skipping 125 matching lines @@
           // Only update if it's actually different.
           if (this.$.input && this.$.input.textContent !== this.value) {
             this.$.input.textContent = this.value;
           }
           this._setHasContent(!!this.value);
         },
       });
     })();
   </script>
 </dom-module>