Firebug displays the class name and location twice in the right panel

When examining a div labeled with .mlm-clearfix, I noticed that Firebug was displaying this class name and its URL twice in the right panel. The style declarations given for the Easy Clear Method in relation to this class are as follows:

.mlm-clearfix:before,
.mlm-clearfix:after {
   content: '\0020';
   display: block;
   overflow: hidden;
   visibility: hidden;
   width: 0;
   height: 0; 
}

After removing one selector and adjusting it to

.mlm-clearfix:after {
   content: '\0020';
   display: block;
   overflow: hidden;
   visibility: hidden;
   width: 0;
   height: 0; 
}

The issue vanished. However, the same duplicate display is not occurring with other combined class selectors like

.search-table td input,
.search-table td select {
    width: 200px;
}

The CSS file is not linked twice. What could be causing this double display? Any insights would be greatly appreciated.

Answer №1

:before and :after are considered as pseudo-elements. (It's worth noting that the correct syntax for them is actually ::before and ::after). These selectors do not style the selected element itself, but rather define new elements that will be styled accordingly.

In the context of the Firefox API, Firebug (2.0.x) internally utilizes a method that only retrieves all styles for a specific pseudo-element. However, there is an issue where Firebug may display the same rule twice within the Style side panel.

To address this issue, it has been suggested that displaying these pseudo-elements in the HTML structure within the HTML panel instead of the Style side panel could resolve the problem (refer to issue 5785).

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