        HTML.
     HTML?

HTML    .     HTML -.  ,   HTML   .    -   .

    Internet     HTML-  World Wide Web Consortium (W3C),   Tim Berners-Lee (!   ,   HTML).      .

  -       - Netscape   .  HTML- .0  3.2.   ,  90%  Netscape      .  , Netscape    ,      .

  Microsoft   Internet.     Netscape,    .     Microsoft' - Internet Explorer -   HTML-  ,  Netscape.  Microsoft      (  ),  Internet Explorer     .

   4  5, Microsoft      HTML-  W3C. Netscape           4.

  .  HTML-  4.01  XHTML.   Internet Explorer   90% .  Internet Explorer     ,      W3C HTML-.       ,   Mozilla, Opera  Netscape.

,    HTML,   W3C,   web-,     -    . ,  , ,      ,       HTML,   XHTML.
! ,    -?

    HTML    ,   "" HTML  ,    - XHTML.    Document Type Definition/  . DTD      :

 1:

      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
 
    <head>
      <title>Title</title>
    </head>
 
   <body>
     <p>text text</p>
   </body>
 
   </html>

 Document Type Definition (  ),   ,      XHTML,         html    xmlns  lang.

xmlns,    "XML-Name-Space",     http://www.w3.org/1999/xhtml.  ,   . ,     ,    namespaces   W3C web-: www.w3.org.

  lang  ,     .      ISO 639,       .     English ("en").

  DTD   ,        HTML.         HTML-. 

DTD        .
?       ?

 DTD    -   HTML            W3C's free validator.

   ,       Internet.    validator.w3.org,   (URL)     .   HTML ,   congratulations message.    -       ,     .      ,  .

 validator      .           ,     (  "").           .     -      . -validator   ,    ,  ,   .

       .