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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 .
Parameter Description _template1, _template2, _template3...: The names of the templates to be processed. The default of _template1 is the base page of the current page. If _template1 is specified, the default for _template2 is its /sandbox subpage; if not, the default for _template2 is the /sandbox subpage of the base page of the current page.
For example, if rolling the mouse over a 'Buy now' link is meant to make the price, elsewhere on the page, become emphasized, JavaScript code can do this, but JavaScript needs to identify the price element, wherever it is in the markup.
A stylesheet, internal or external, specifies the style once for a range of HTML elements selected by class, type or relationship to others. This is much more efficient than repeating style information inline for each occurrence of the element.
SpiderMonkey is also used in many other open-source projects; an external list is maintained at Mozilla's developer site. [29] SpiderMonkey includes a JavaScript Shell for interactive JavaScript development and for command-line invocation of JavaScript program files. [30]
JavaScript Python MDN Web Docs , previously Mozilla Developer Network and formerly Mozilla Developer Center , is a documentation repository and learning resource for web developers .
An inline comment is a comment that is located on the same line as and to the right of program code to which is refers. [8] Both prologue and inline comments can be represented as either line or block comments.
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.