
 (attribute)
 HTML
 (author)
 HTML 
  (block-level element)
,        ( 'H1'  HTML)
 (canvas)
  UA    () 
  (child element)
subelement   SGML [5]
  (contextual selector)
,          .       .    'H1.initial B'     , 'H1.initial'  'B'.
CSS
   (Cascading Style Sheets)
CSS1
  ,  1.    CSS1,        .
  CSS1 (CSS1 advanced features)
,    ,         CSS1
  CSS1 (CSS1 core features)
 CSS1,       UA,  CSS1
 CSS1 ( CSS1)
UA,   CSS1
 (declaration)
 ( 'font-size')    ( '12pt')
 (designer)
  
 (document)
HTML 
 (element)
HTML 
  ( type)
    SGML [5]
   (fictional tag sequence)
   -  -
  (font size)
,    
HTML
   (Hypertext Markup Language) [2],    SGML.
 HTML (HTML extension)
,   UA,      .  "FONT", "CENTER"  "BLINK"    HTML,     "BGCOLOR".    CSS     HTML.
  (inline element)
,         ( 'STRONG'  HTML)
  (intrinsic dimensions)
  ,   ,    .    ,       .
  (parent element)
    SGML [5]
- (pseudo-element)
-    CSS     (   ),    .
- (pseudo-class)
-    CSS           HTML   (  ,    ).
 (property)
        CSS.         .
 (reader)
,    () 
  (replaced element
,      .  HTML  'IMG', 'INPUT', 'TEXTAREA', 'SELECT'  'OBJECT'    .    'IMG'  ,   SRC. CSS1  ,    .
 (rule)
 ( 'font-family: helvetica')    ( 'H1')
 (selector)
, ,      .     ( 'H1')   ( 'H1 B'),      .
SGML
    (Standard Generalized Markup Language) [5],   HTML    
  (simple selector)
,        / ,       .  'P.initial'   .
  (style sheet)
 
UA
User Agent,  -  -
 (user)
,   
 (weight)
 

     ('...')     HTML  CSS.