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The Document Object Model (DOM) is a cross-platform and language-independent interface that treats an HTML or XML document as a tree structure wherein each node is an object representing a part of the document. The DOM represents a document with a logical tree. Each branch of the tree ends in a node, and each node contains objects.
For example, the Document Object Model (DOM) is a collection of objects that represent a page in a web browser, used by script programs to examine and dynamically change the page. There is a Microsoft Excel object model [1] for controlling Microsoft Excel from another program, and the ASCOM Telescope Driver is an object model for controlling an ...
The root node at the top (with the value 2 here), has no parent as it is the highest in the tree hierarchy. In computer science, a tree is a widely used abstract data type that represents a hierarchical tree structure with a set of connected 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).
Component Object Model (COM) is a binary-interface technology for software components from Microsoft that enables using objects in a language-neutral way between different programming languages, programming contexts, processes and machines.
The term hierarchy is used to stress a hierarchical relation among the elements. The XML specification defines an XML document as a well-formed text if it satisfies a list of syntax rules defined in the specification. This specification is long, however 2 key points relating to the tree structure of an XML document are:
Information systems can be modeled with objects representing their components and interfaces. [1]: 39 In the relational model of database management, aspects such as table and column may act as objects. [2] Objects of a distributed computing system tend to be larger grained, longer lasting, and more service-oriented than programming objects.
An object hierarchy is a concept from computer programming. It references descendants of objects acting as properties of an object. An example of this would be the object controlling a window (at the top of the hierarchy) having another object like the window's border acting as a property of the window. [1]