3. 

 CSS           ,    .      :     /.
 
      ()     :
  @import url(http://www.style.org/pastoral);
  @import url(http://www.style.org/marine);
  H1 { color: red }     /*    */
 /
             .            . UA          .

      ,    .     ,     .      ,   ,  . ..,         ,    .  ,         UA.

        ,     ,  .  ,     ,     .          , ,    .

 CSS1   '@import'         .          .
3.1 'important'

      :
  H1 { color: black ! important; background: white ! important }
  P  { font-size: 12pt ! important; font-style: italic }

        ,      .

      'important'        .              .
3.2  

     CSS.     /,    :

1.   ,    /.  ,    .    ,   .    ,    .

2.     : ,   '!important',   ,   () .

3.   :       ,      UA.       ,   .

4.    :      .         ID   (a),       (b)       (c).    (     )    .  :
       LI            {...}  /* a=0 b=0 c=1 ->  =   1 */
       UL LI         {...}  /* a=0 b=0 c=2 ->  =   2 */
       UL OL LI      {...}  /* a=0 b=0 c=3 ->  =   3 */
       LI.red        {...}  /* a=0 b=1 c=1 ->  =  11 */
       UL OL LI.red  {...}  /* a=0 b=1 c=3 ->  =  13 */
       #x34y         {...}  /* a=1 b=0 c=0 ->  = 100 */

-  -   ,      .

5.    :      ,   .             .

     ,         ,     /.

        ,   .             .

   'STYLE'  (.  1.1)    ,     ID ,    :
<STYLE TYPE="text/css">
  #x97z { color: blue }
</STYLE>

<P ID=x97z STYLE="color: red">

     'P'  .      ,    'STYLE'    ID   5.

UA  -    HTML,  'ALIGN'.  ,         CSS    1.  ,                  .            .