title: HTML1115: X-UA-Compatible META tag ('IE=9, IE=8, chrome=1') ignored because document mode is already finalized
body: <p>I got such warning:</p>
  
  <pre><code>HTML1115: X-UA-Compatible META tag ('IE=9, IE=8, chrome=1') ignored because document mode is already finalized.
  </code></pre>
  
  <p>when I try to open my website at IE9. I have addthis script: </p>
  
  <pre><code>&lt;script type="text/javascript" src="https://s7.addthis.com/js/250/addthis_widget.js#async=1"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>which adds google+ button </p>
  
  <pre><code>&lt;a class="addthis_button_google_plusone" g:plusone:size="medium"&gt;&lt;/a&gt;
  </code></pre>
  
  <p>When I comment this line - warning disappear. How I can fix this?</p>