WebKit cannot set "auto <length>" to columns property.

by syoichi

JavaScript

(function () {
  document.head.style.webkitColumns = 'auto 12em';

  document.body.insertAdjacentHTML('AfterBegin', [
      '-webkit-column-width: ' + document.head.style.webkitColumnWidth,
      '-webkit-column-count: ' + document.head.style.webkitColumnCount
  ].join('<br>'));
}());