WHAT IS AN OBJECT?

• Objects group together a set of variables and functions to create a model of a something you would recognize from the real world. In an object, variables and functions take on new names. ]

  document object model:

• The browser represents the page using a DOM tree. DOM trees have four types of nodes: document nodes, element nodes, attribute nodes, and text nodes.
• You can select element nodes by their id or cl ass attributes, by tag name, or using CSS selector syntax. Whenever a DOM query can return more than one node, it will always return a Nadel i st.
• From an element node, you can access and update its content using properties such as textContent and i nnerHTML or using DOM manipulation techniques.
• An element node can contain multiple text nodes and child elements that are siblings of each other.
• In older browsers, implementation of the DOM is inconsistent (and is a popular reason for using jQuery). Browsers offer tools for viewing the DOM tree .

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