The most common DOM methods at a glance
Reaching Elements in a Document

Creating New Nodes

document.getElementById('id'): Retrieves the element with
the given id as an object

document.createElement(element): Creates a new element
node with the name element. You provide the name as a string.

document.getElementsByTagName('tagname'): Retrieves all
elements with the tag name tagname and stores them in an arraylike list

document.createTextNode(string): Creates a new text node
with the node value of string.

Reading Element Attributes, Node Values and Other Data
node.getAttribute('attribute'): Retrieves the value of the
attribute with the name attribute
node.setAttribute('attribute', 'value'): Sets the value
of the attribute with the name attribute to value
node.nodeType: Reads the type of the node (1 = element, 3 = text
node)
node.nodeName: Reads the name of the node (either element
name or #textNode)
node.nodeValue: Reads or sets the value of the node (the text
content in the case of text nodes)

Navigating Between Nodes
node.previousSibling: Retrieves the previous sibling node and
stores it as an object.
node.nextSibling: Retrieves the next sibling node and stores it
as an object.
node.childNodes: Retrieves all child nodes of the object and
stores them in an list. here are shortcuts for the first and last child
node, named node.firstChild and node.lastChild.
node.parentNode: Retrieves the node containing node.

newNode = node.cloneNode(bool): Creates newNode as a copy
(clone) of node. If bool is true, the clone includes clones of all the
child nodes of the original.
node.appendChild(newNode): Adds newNode as a new (last) child
node to node.
node.insertBefore(newNode,oldNode): Inserts newNode as a
new child node of node before oldNode.
node.removeChild(oldNode): Removes the child oldNode from
node.
node.replaceChild(newNode, oldNode): Replaces the child
node oldNode of node with newNode.
element.innerHTML: Reads or writes the HTML content of the given
element as a string—including all child nodes with their attributes and
text content.

Known browser quirks:
getAttribute and setAttribute are not reliable. Instead, assign
the property of the element object directly: obj.property = value.
Furthermore, some attributes are actually reserved words, so instead
of class use className and instead of for use HTMLfor.
Real DOM compliant browsers will return linebreaks as text nodes in
the childNodes collection, make sure to either remove them or test
for the nodeType.

Assembled by Christian Heilmann (http://wait-till-i.com), licensed Creative Commons Attribution (http://creativecommons.org/licenses/by/3.0/). Enjoy.