title: are attributes without value allowed in HTML4?
body: <p>I wonder if HTML 4 allows attributes without value, as being equivalent to attributes with an empty value. For example:</p>
  
  <pre><code>&lt;h2 section&gt;foobar&lt;/h2&gt;
  </code></pre>
  
  <p>instead of:<code>&lt;h2 section=""&gt;foobar&lt;/h2&gt;</code></p>
  
  <p>Are the two snippets equally valid? If not, are they valid in HTML version 5?</p>
  
  <p>thanks!</p>