//
// Remove inline style="..."
// Preserve hidden content.
//
// Call the function like this:
// var all = document.getElementsByTagName('*');
// remove_style(all);
//
// Note: Selecting all elements in the page via a
// wildcard query could be slow, depending on how
// many elements are in the page. You could use a
// smaller set of elements to be more performant.
//
// var set = document.getElementById('foo').getElementsByTagName('bar');
// remove_style(set);
//

function remove_style(all) {
  var i = all.length;
  var j, is_hidden;

  // Presentational attributes.
  var attr = [
    'align',
    'background',
    'bgcolor',
    'border',
    'cellpadding',
    'cellspacing',
    'color',
    'face',
    'height',
    'hspace',
    'marginheight',
    'marginwidth',
    'noshade',
    'nowrap',
    'valign',
    'vspace',
    'width',
    'vlink',
    'alink',
    'text',
    'link',
    'frame',
    'frameborder',
    'clear',
    'scrolling',
    'style'
  ];

  var attr_len = attr.length;

  while (i--) {
    all[i].style.display === 'none' ? is_hidden = true : is_hidden = false;

    j = attr_len;

    while (j--) {
      all[i].removeAttribute(attr[j]);
    }

    // Re-hide display:none elements,
    // so they can be toggled via JS.
    if (is_hidden) {
      all[i].style.display = 'none';
      is_hidden = false;
    }
  }
}