code>&lt;input&gt;</code> attributes within the input
helper:</p>
<table>
  <tr><td>`readonly`</td><td>`required`</td><td>`autofocus`</td></tr>
  <tr><td>`value`</td><td>`placeholder`</td><td>`disabled`</td></tr>
  <tr><td>`size`</td><td>`tabindex`</td><td>`maxlength`</td></tr>
  <tr><td>`name`</td><td>`min`</td><td>`max`</td></tr>
  <tr><td>`pattern`</td><td>`accept`</td><td>`autocomplete`</td></tr>
  <tr><td>`autosave`</td><td>`formaction`</td><td>`formenctype`</td></tr>
  <tr><td>`formmethod`</td><td>`fo