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DOM 0. JavaScript. DOM - (forms [ ], images [ ], anchors [ ], links [ ] applets [ ]), .
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DOM Level 3 DOM. (2009 ).
HTML- , DOM .
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(parent node) - , . - (child node) - , . - (sibling node) - . DOM .
AJAX.
AJAX, Ajax ( JavaScript XML) -, -. - , - .
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XMLHttpRequest
XMLHttpRequest . XML, . API( ) , JavaScript, VBScipt XML HTTP.
XMLHttpRequest :
1. XMLHttpRequest.
2. onreadystatechange.
3. open.
4. send.
