title: Is it allowed to have line breaks in HTML5 meta's content?
body: <p>Given one meta tag as an example:</p>
  
  <p><code>&lt;meta property="og:description" content="this is just a content"&gt;</code></p>
  
  <p>Is it allowed to have line breaks in that meta's content field?</p>
  
  <p>The reason to ask this is because I like to fill description in Open Graph programmably, which is to extract summary from full content. There would be some line breaks in the extract summary and I'm wondering if it is allowable here.</p>