Roll third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html

Index: third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html
diff --git a/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html b/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html
index 5f5e645f77f4e38bd292a6defe5e3eb39362aa79..622648f08035f0cadd4e088c2fddc259dd4b7237 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html
+++ b/third_party/polymer/v1_0/components-chromium/paper-tabs/paper-tabs.html
@@ -52,7 +52,7 @@ between different views.
 
 
 To use links in tabs, add `link` attribute to `paper-tab` and put an `<a>`
-element in `paper-tab`.
+element in `paper-tab` with a `tabindex` of -1.
 
 Example:
 
@@ -66,13 +66,13 @@ Example:
 
 &lt;paper-tabs selected="0">
   &lt;paper-tab link>
-    &lt;a href="#link1" class="link">TAB ONE&lt;/a>
+    &lt;a href="#link1" class="link" tabindex="-1">TAB ONE&lt;/a>
   &lt;/paper-tab>
   &lt;paper-tab link>
-    &lt;a href="#link2" class="link">TAB TWO&lt;/a>
+    &lt;a href="#link2" class="link" tabindex="-1">TAB TWO&lt;/a>
   &lt;/paper-tab>
   &lt;paper-tab link>
-    &lt;a href="#link3" class="link">TAB THREE&lt;/a>
+    &lt;a href="#link3" class="link" tabindex="-1">TAB THREE&lt;/a>
   &lt;/paper-tab>
 &lt;/paper-tabs>
 </code></pre>
@@ -84,7 +84,7 @@ The following custom properties and mixins are available for styling:
 Custom property | Description | Default
 ----------------|-------------|----------
 `--paper-tabs-selection-bar-color` | Color for the selection bar | `--paper-yellow-a100`
-`--paper-tabs-selection-bar` | Mixin applied to the selection bar | {}
+`--paper-tabs-selection-bar` | Mixin applied to the selection bar | `{}`
 `--paper-tabs` | Mixin applied to the tabs | `{}`
 
 @hero hero.svg
@@ -102,9 +102,9 @@ Custom property | Description | Default
         font-size: 14px;
         font-weight: 500;
         overflow: hidden;
-          -moz-user-select: none;
-          -ms-user-select: none;
-          -webkit-user-select: none;
+        -moz-user-select: none;
+        -ms-user-select: none;
+        -webkit-user-select: none;
         user-select: none;
 
         /* NOTE: Both values are needed, since some phones require the value to be `transparent`. */