title: Max length of an HTML attribute value
body: <p>How would I know what the maximum length of an element's attribute value is?</p>
  
  <p>e.g.</p>
  
  <pre><code>&lt;div id="value1..."&gt;&lt;/div&gt;
  </code></pre>
  
  <p>What's the maximum allowable length for ID attribute of this div and any other attributes of any elements?</p>