This procedure adds the link tag to load a CSS library. If a library has already been added, it will not be added a second time.
Syntax
APEX_CSS.ADD_FILE (
    p_name           IN    VARCHAR2,
    p_directory      IN    VARCHAR2 DEFAULT APEX.G_IMAGE_PREFIX||'css/',
    p_version        IN    VARCHAR2 DEFAULT NULL,
    p_skip_extension IN    BOOLEAN DEFAULT FALSE
    p_media_query    IN    VARCHAR2 DEFAULT NULL,
    p_ie_condition   IN    VARCHAR2 DEFAULT NULL);
Parameters
Table 6-3 ADD_FILE Parameters
| Parameter | Description | 
|---|---|
| 
 
  | 
 Name of the CSS file.  | 
| 
 
  | 
 Begin of the URL where the CSS file should be read from. If you use this function for a plug-in you should set this parameter to   | 
| 
 
  | 
 Identifier of the version of the CSS file. The version will be added to the CSS filename. In most cases you should use the default of NULL as the value.  | 
| 
 
  | 
 The function automatically adds ".css" to the CSS filename. If this parameter is set to TRUE this will not be done.  | 
| 
 
  | 
 Value set as media query.  | 
| 
 
  | 
 Condition used as Internet Explorer condition.  | 
Example
Adds the CSS filejquery.autocomplete.css in the directory specified by p_plugin.image_prefix to the HTML output of the page and makes sure that it will only be included once if apex_css.add_file is called multiple times with that name.
apex_css.add_file (
    p_name => 'jquery.autocomplete',
    p_directory => p_plugin.image_prefix );