The model of object of document (DOM) is an interface of programming for the documents HTML and XML. It facilitates a representation structured of the document and define of which way the programs can access, finally to modify, so much his structure, style and content. The DOM gives a representation of the document like a group of nodes and objects structured that have properties and methods. Essentially, it connects the pages web to scripts or programming languages.
The W3C DOM standard forms the base of the operation of the DOM in a lot of modern browsers. Several browsers offer extensions further of the standard W3C, it is necessary to go with extreme care when using them in the web, since the documents can be consulted by browsers that have DOMs different.