title: Accessibility: YouTube Embed Code Should Have Title Attribute
body: <p>I am sure this has been brought up many times before, but here it is again. It would be really great for accessibility, if YouTube's default iframe embed code were to include a title attribute with the name of the video as the value, like so: </p>
  
  <p><code>&lt;iframe width="560" height="315" src="https://www.youtube.com/embed/8dCUzOiMRy4" frameborder="0" title="The art of labeling -- A11ycasts #12" allow="autoplay; encrypted-media" allowfullscreen&gt;&lt;/iframe&gt;</code></p>
  
  <p>This would aid assistive technology users to understand the contents of the iframe source more easily. While the title attribute is generally frowned upon, it still serves a useful purpose where accessibility is concerned. Especially on iframes. See <a href="https://developer.paciellogroup.com/blog/2010/11/using-the-html-title-attribute/" rel="nofollow noreferrer">https://developer.paciellogroup.com/blog/2010/11/using-the-html-title-attribute/</a> </p>
  
  <p>This is a common issue that is flagged in many an automated testing tool as well, so I'm sure many developers would love to see this issue addressed at the source.  Literally.</p>