title: Meta tag 'there is no attribute "property" ' and other attribute error:
body: <p>I tried to validate my site and i get this following error</p>
  
  <p><strong>there is no attribute "property"</strong></p>
  
  <pre><code> &lt;meta property="og:title" content="Free Sms" /&gt;
  </code></pre>
  
  <p><strong>there is no attribute "allowTransparency"</strong></p>
  
  <pre><code>…w:hidden; width:450px; height:21px;" allowTransparency="true"&gt;Facebook&lt;/iframe&gt;
  </code></pre>
  
  <p><strong>there is no attribute "placeholder"</strong></p>
  
  <pre><code>…"search" type="text" placeholder="SEARCH" value="" class="searchInp …
  </code></pre>
  
  <p>First my code has this and i get 13 errors.</p>
  
  <pre><code> &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"&gt;
  </code></pre>
  
  <p>Changing the code to this reduce my error. but I get the 3 errors.Why? Any guide how to fix this?</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:og="http://ogp.me/ns#"
        xmlns:fb="https://www.facebook.com/2008/fbml"
        xml:lang="en" lang="en"&gt; 
  </code></pre>
  
  <p>Complete</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:og="http://ogp.me/ns#"
        xmlns:fb="https://www.facebook.com/2008/fbml"
        xml:lang="en" lang="en"&gt; 
  &lt;head&gt; 
      &lt;title&gt;Welcome to mysite&lt;/title&gt;
                     &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"/&gt;
                     &lt;meta content="text/html; charset=utf-8" http-equiv="Content-Type" /&gt; 
                     &lt;meta name="keywords" content="Social, Programming" /&gt;
                     &lt;meta name="description" content="Share Ideas and become the best" /&gt;
                     &lt;meta http-equiv="Content-Language" content="en" /&gt;
                     &lt;meta name="robots" content="*" /&gt;
                     &lt;meta name="document-type" content="text" /&gt;
                     &lt;meta name="googlebot" content="NOODP" /&gt;
                     &lt;meta name="slurp" content="NOYDIR" /&gt;
                     &lt;meta name="msnbot" content="NOODP" /&gt;
                     &lt;meta name="Generator" content="snippet" /&gt;
                     &lt;meta property="og:title" content="Welcome to mysite" /&gt;
                     &lt;meta property="og:type" content="website" /&gt;
                     &lt;meta property="og:url" content="" /&gt;
                     &lt;meta property="og:description" content="Share Ideas and become the best" /&gt;
                     &lt;meta property="fb:app_id" content="" /&gt;
                     &lt;meta property="og:image" content="http://mysite.com/images/fbicon.png" /&gt;
  </code></pre>