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Custom elements can be created using ES (ECMAScript, most commonly JavaScript) modules with classes. Custom element definition comprises CSS style, HTML template of the element's local DOM, element properties, lifecycle callbacks and JavaScript methods:
In HTML DOM (Document Object Model), every element is a node: [4] 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.
The HTML elements in the document are available as a hierarchical tree of individual objects, making it possible to examine and modify an element and its attributes by reading and setting properties and by calling methods. The text between elements is also available through DOM properties and methods.
Both have event listeners registered on the same event type, say "click". When the user clicks on the inner element, there are two possible ways to handle it: Trigger the elements from outer to inner (event capturing). This model is implemented in Netscape Navigator. Trigger the elements from inner to outer (event bubbling). This model is ...
However, in actual usage, the term attribute can and is often treated as equivalent to a property depending on the technology being discussed. An attribute of an object usually consists of a name and a value. For an element these can be a type and class name, while for a file these can be a name and an extension, respectively.
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .
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Download as PDF; Printable version; In other projects ... This is a list of notable JavaScript libraries. Constraint programming . Cassowary (software) ...