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When a web page is loaded, the browser creates a Document Object Model of the page, which is an object oriented representation of an HTML document that acts as an interface between JavaScript and the document itself. This allows the creation of dynamic web pages, [13] because within a page JavaScript can:
Function declarations, which declare a variable and assign a function to it, are similar to variable statements, but in addition to hoisting the declaration, they also hoist the assignment – as if the entire statement appeared at the top of the containing function – and thus forward reference is also possible: the location of a function ...
When the browser parses a document, it creates a collection of objects that define the document and detail how it should be displayed. The object the browser creates is known as the Document Object Model (DOM). It is part of a larger collection of objects that the browser makes use of. This collection of browser objects is collectively known as ...
Bookmarklets are saved and used as normal bookmarks. As such, they are simple "one-click" tools which add functionality to the browser. For example, they can: Modify the appearance of a web page within the browser (e.g., change font size, background color, etc.) Extract data from a web page (e.g., hyperlinks, images, text, etc.)
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 page. Ajax is not a new technology, nor is it a new language.
Learn how to enable JavaScript in your browser to access additional AOL features and content.
Similar controls over web storage are also available through 3rd party browser extensions. Each browser stores Web storage objects differently: Firefox saves Web storage objects in a SQLite file called webappsstore.sqlite in the user's profile folder. [16] Google Chrome records Web storage data in a SQLite file in the user's
A browser's cache stores temporary website files which allows the site to load faster in future sessions. This data will be recreated every time you visit the webpage, though at times it can become corrupted. Clearing the cache deletes these files and fixes problems like outdated pages, websites freezing, and pages not loading or being ...