Merge pull request #4030 from shaedrich/dom

Add topic "DOM"

topics/dom/index.md

@@ -0,0 +1,22 @@
+---
+aliases: dom-tree, dom-node, dom-element, dom-elements
+created_by: World Wide Web Consortium
+display_name: Document Object Model (DOM)
+github_url: https://github.com/whatwg/dom
+released: October 1, 1998
+short_description: DOM is a cross-platform and language-independent interface that treats an HTML or XML document as a tree structure.
+topic: dom
+url: https://dom.spec.whatwg.org/
+wikipedia_url: https://en.wikipedia.org/wiki/Document_Object_Model
+related: shadow-dom, virtual-dom, html, xml, dhtml
+---
+**DOM** (short for **D**ocument **O**bject **M**odel) 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. DOM methods allow programmatic access to the tree; with them one can change the structure, style or content of a document. Nodes can have event handlers (also known as event listeners) attached to them. Once an event is triggered, the event handlers get executed.
+
+The principal standardization of the DOM was handled by the World Wide Web Consortium (W3C), which last developed a recommendation in 2004. WHATWG took over the development of the standard, publishing it as a living document. The W3C now publishes stable snapshots of the WHATWG standard.
+
+In HTML DOM (Document Object Model), every element is a node:
+* A document is a document node.
+* All HTML elements are element nodes.
+* All HTML attributes are attribute nodes.
+* Text inserted into HTML elements are text nodes.
+* Comments are comment nodes.