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- ( . proxy , ) ( ) , . - - (, e-mail), . - , ( , ). - . - .
4. HTML ( . HyperText Markup Language ) . - HTML ( XHTML). HTML , .
5. AJAX, Ajax (ˈeɪdʒæks, . Asynchronous Javascript and XML JavaScript XML) -, -. , , - , - .
AJAX - , , , .
AJAX . , , , .
, .
AJAX , . AJAX :
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, , :
XMLHttpRequest ( );
[1];
<script>[2].
<img>, google analytics.
DHTML ;
, HTML-, JSON XML.
RSS XML-, , , . . , RSS, , -. RSS 2.0 , , . - RSS RSS-, RSS- RSS-.
, - RSS-, Safari, Maxthon, Miranda, Mozilla Firefox, Mozilla Thunderbird, Opera, Opera Mini, Windows Internet Explorer ( 7- ). , (RSS-), RSS-. - RSS- - , .
RSS- HTML-, CDATA , HTML- PCDATA . , .