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JavaScript is an event-based imperative programming language (as opposed to HTML's declarative language model) that is used to transform a static HTML page into a dynamic interface. JavaScript code can use the Document Object Model (DOM), provided by the HTML standard, to manipulate a web page in response to events, like user input.
CSS-in-JS is a styling technique by which JavaScript is used to style components. When this JavaScript is parsed, CSS is generated (usually as a <style> element) and attached into the DOM. It enables the abstraction of CSS to the component level itself, using JavaScript to describe styles in a declarative and maintainable way.
It introduced the getElementById function as well as an event model and support for XML namespaces and CSS. DOM Level 3, published in April 2004, added support for XPath and keyboard event handling, as well as an interface for serializing documents as XML. HTML5 was published in October 2014. Part of HTML5 had replaced DOM Level 2 HTML module.
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.
These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console showing all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.
Since the append procedure must completely copy all of its arguments except the last, both its time and space complexity are O() for a list of elements. It may thus be a source of inefficiency if used injudiciously in code.
JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t /), often abbreviated as JS, is a programming language and core technology of the Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
Classes are defined in the HTML document (generated by the server or by JavaScript). They are used as selectors in CSS. Learn to use the browser inspectors of Firefox, lE, Chrome or Safari to inspect the webpages. By default much of the CSS and JavaScript resources are processed for efficiency.