A document object model (dom) tree is a hierarchical representation of an html or xml document It gives authors freedom in organizing their code and allows separation of document content from scripting It consists of a root node, which is the document itself, and a series of child nodes that represent the elements, attributes, and text content of the document
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Each node in the tree has a parent node, except for the root node, and can have multiple child nodes.
Event bubbling is a type of dom event propagation [1] where the event first triggers on the innermost target element, and then successively triggers on the ancestors (parents) of the target element in the same nesting hierarchy till it reaches the outermost dom element or document object [2] (provided the handler is initialized).
Event attributes, added in html version 4, allow an element to specify scripts to be run under specific circumstances The table below lists some common event handler attributes, and some elements they can function with. [1][2] the application of dhtml was introduced by microsoft with the release of internet explorer 4 in 1997
