title: Validation error: "The itemprop attribute was specified, but the element is not a property of any item"
body: <p>For better SEO I need put some meta on my page like this:</p>
  
  
  
  <pre class="lang-html prettyprint-override"><code>&lt;!-- Schema.org markup for Google+ --&gt;
  &lt;meta itemprop="name" content="The Name or Title Here"&gt;
  &lt;meta itemprop="description" content="This is the page description"&gt;
  &lt;meta itemprop="image" content="http://www.example.com/image.jpg"&gt; 
  </code></pre>
  
  <p><a href="http://moz.com/blog/meta-data-templates-123">Here is the source</a>.</p>
  
  <p>Then I check this code on <a href="http://validator.w3.org/#validate_by_input">Markup Validation Service</a>:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head lang="en"&gt;
    &lt;meta itemprop="name" content="The Name or Title Here"&gt;
    &lt;meta itemprop="description" content="This is the page description"&gt;
    &lt;meta itemprop="image" content="http://www.example.com/image.jpg"&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;My title&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
    My body.
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Throwing this error:</p>
  
  <blockquote>
    <p>Line 4, Column 57: The <code>itemprop</code> attribute was specified, but the element is not a property of any item.</p>
  
  <pre class="lang-html prettyprint-override"><code> &lt;meta itemprop="name" content="The Name or Title Here"&gt;
  </code></pre>
    
    <p>Line 5, Column 70: The <code>itemprop</code> attribute was specified, but the element is not a property of any item.</p>
  
  <pre class="lang-html prettyprint-override"><code> &lt;meta itemprop="description" content="This is the page description"&gt;
  </code></pre>
    
    <p>Line 6, Column 68: The <code>itemprop</code> attribute was specified, but the element is not a property of any item.</p>
  
  <pre class="lang-html prettyprint-override"><code> &lt;meta itemprop="image" content="http://www.example.com/image.jpg"&gt;
  </code></pre>
  </blockquote>
  
  <p>How can I fix this?</p>