6   .
6.1   

       ("+"  "-",   "+"),   (  ,   ,  ),        ,       .   "0"    .

     ,          ,   .     ,        .

    :   .        .      ,            (.      ).        (  ),     (. 'x-large').

   :
  H1 { margin: 0.5em }      /* ems,    */
  H1 { margin: 1ex }        /* x-height, ~    'x' */
  P  { font-size: 12px }    /* pixels,     */

  'em'  'ex'      .         " " ('font-size'),   'em'  'ex'      .

,    ,    ,   -  .          , UA     .     ,           90     ,   .    28      0,0227 .

    ,   :
  BODY {
    font-size: 12pt;
    text-indent: 3em;  /* i.e. 36pt */
  }
  H1 { font-size: 15pt }

      ('text-indent')  H1   36 ,   45.

       ,       .    :
  H1 { margin: 0.5in }      /* inches, 1in = 2.54cm */
  H2 { line-height: 3cm }   /* centimeters */
  H3 { word-spacing: 4mm }  /* millimeters */
  H4 { font-size: 12pt }    /* points, 1pt = 1/72 in */
  H5 { font-size: 1pc }     /* picas, 1pc = 12pt */

 ,       , UA   .        CSS1      .
6.2  

       ("+"  "-",   "+"),   (  ,   ,  ),    "%",       .

      , ,   .            -       :
  P { line-height: 120% }   /* 120%    */

    CSS1 ,         ,      ,    .
6.3  

    ,     RGB.

      : aqua (-), black (), blue (), fuchsia (-), gray (), green (), lime (-), maroon (), navy (-), olive (), purple (), red (), silver (-), teal (-), white (),  yellow ().  16     VGA  Windows,    RGB     .
  BODY {color: black; background: white }
  H1 { color: maroon }
  H2 { color: olive }

   RGB   .         :
  EM { color: #f00 }              /* #rgb */
  EM { color: #ff0000 }           /* #rrggbb */
  EM { color: rgb(255,0,0) }      /* integer range 0 - 255 */
  EM { color: rgb(100%, 0%, 0%) } /* float range 0.0% - 100.0% */

   RGB         #,          .   RGB (#rgb)      ,    . , #fb0   #ffbb00.  ,    (#ffffff)      (#fff),           .

  RGB    : 'rgb('         (      0-255        0.0%  100.0%),  ')'.

      .     :
  EM { color: rgb(255,0,0) }       /*    0 - 255 */
  EM { color: rgb(300,0,0) }       /*   255 */
  EM { color: rgb(110%, 0%, 0%) }  /*   100% */

 RGB     sRGB [9]. UA       ,      ,   sRGB            [10].

UA         ,    .     sRGB   2.2. UA   CSS   ,       ""  ,  2.2.   D    .  ,      ,   CSS, ,  ,         .
6.4 URL

   (URL)    :
  BODY { background: url(http://www.bg.com/pinkish.gif) }

  URL   'url(',   ,    (')    ("),   URL (   [11]),    (')    ("),   ,  ')'.  ,      URL,   .

 , , ,    ,   URL,    : '\(', '\)', '\,'.

 URL     ,     :

  BODY { background: url(yellow) }