Request for fieldset legend CSS override workaround

I have found a number of browsers (Firefox for example) that ignore CSS style overrides for the legend tag that is inside the fieldset tag.
This becomes a problem when trying to make a custom theme that overrides the look and feel from the standard drupal way.
After some research, I found that putting a span tag inside the legend tag (wrapping the legend text) is a successful work-around that does not break normal behavior.

I am requesting that this workaround be implemented upstream.

I have attached a patch that makes the obvious changes needed to wrap a fieldset legend.

Here is some example CSS that overrides the fieldset with the attached patch:

div.node-form div.standard fieldset {
  position: relative;

  border: 1px;
  padding: 0px;
  margin: 0px;
  
  left: 0px;
}
  
div.node-form div.standard fieldset legend span {
  display: block;
  position: relative;

  font-size: 16px;
  font-weight: bold;

  line-height: 19px;

  background-color: #b0b0ff;

  border-style: ridge;
  border-width: 2px;

  padding-left: 8px;

  width: 1238px;
  left: -2px;
  right: auto;
}

Without the patch (and removing the trailing span from div.node-form div.standard fieldset legend span {) the legend would fail to be changed via CSS.
This is primarily a Mozilla bug.