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This will write "Hello world!" on every page, below the title, until you remove the code. User scripts are written in JavaScript, and both of the above code snippets are in JavaScript. The second snippet uses JQuery, a JavaScript library that specializes in manipulating HTML. $ is a JQuery function that lets us target the HTML element we want.
Elements in an HTML or XML document are represented as nodes in the DOM tree. Each element node has a tag name and attributes, and can contain other element nodes or text nodes as children. For example, an HTML document with the following structure:
HTML and CSS can be used in combination to mark up and style information. The webpage can be modified by JavaScript to dynamically display (and allow the user to interact with) the new information. The built-in XMLHttpRequest object is used to execute Ajax on webpages, allowing websites to load content onto the screen without refreshing the ...
XML Base defines the xml:base attribute, which may be used to set the base for resolution of relative URI references within the scope of a single XML element. XML Information Set or XML Infoset is an abstract data model for XML documents in terms of information items. The infoset is commonly used in the specifications of XML languages, for ...
Dynamic HTML, or DHTML, is a term which was used by some browser vendors to describe the combination of HTML, style sheets and client-side scripts (JavaScript, VBScript, or any other supported scripts) that enabled the creation of interactive and animated documents.
XMLHttpRequest (XHR) is an API in the form of a JavaScript object whose methods transmit HTTP requests from a web browser to a web server. [1] The methods allow a browser-based application to send requests to the server after page loading is complete, and receive information back. [2] XMLHttpRequest is a component of Ajax programming.
XInclude is a generic mechanism for merging XML documents, by writing inclusion tags in the "main" document to automatically include other documents or parts thereof. [1] The resulting document becomes a single composite XML Information Set. The XInclude mechanism can be used to incorporate content from either XML files or non-XML text files.
XSD (XML Schema Definition), a recommendation of the World Wide Web Consortium , specifies how to formally describe the elements in an Extensible Markup Language document. It can be used by programmers to verify each piece of item content in a document, to assure it adheres to the description of the element it is placed in. [1]