The patch to implement: Validate properties specified for sorting and grouping in index views. Original patch from martin.v.loewis via: https://hg.python.org/tracker/roundup/rev/439bd3060df2 Applied by John Rouillard with some modification to properly identify if the bad property is a sort or grouping property. Tests added. has an issue with the current code base. Apparently sometime it can be entered without self.classname being defined. As a result the property lookup fails. So guard it by checking for self.classname in a couple of spots and if self.classname is not set just append the property and let the target action sort it out.

//
// Close icons
// --------------------------------------------------


.close {
  float: right;
  font-size: 20px;
  font-weight: bold;
  line-height: @baseLineHeight;
  color: @black;
  text-shadow: 0 1px 0 rgba(255,255,255,1);
  .opacity(20);
  &:hover {
    color: @black;
    text-decoration: none;
    cursor: pointer;
    .opacity(40);
  }
}

// Additional properties for button version
// iOS requires the button element instead of an anchor tag.
// If you want the anchor version, it requires `href="#"`.
button.close {
  padding: 0;
  cursor: pointer;
  background: transparent;
  border: 0;
  -webkit-appearance: none;
}