JavaScript Language | 10 Minute‐Test 25

The difference between localStorage and sessionStorage has to do with lifetime and scope: how long the data is saved for and who the data is accessible to.

The main advantage of using the src attribute is that it simplifies your HTML files by allowing you to remove large blocks of JavaScript code from them—that is, it helps keep content and behavior separate.

In client-side JavaScript, the Window object is also the global object. This means that the Window object is at the top of the scope chain and that its properties and methods are effectively global variables and global functions.

There is no object called Position.

Like Dojo, it is a large, all-encompassing library with language utilities, DOM utilities, UI widgets, and so on. There are actually two incompatible versions of YUI, known as YUI 2 and YUI 3.

setTimeout() returns a value that can be passed to clearTimeout() to cancel the execution of the scheduled function.

The replace() method is similar, but it removes the current document from the browsing history before loading the new document. When a script unconditionally loads a new document, the replace() method is often a better choice than assign().

IE supports clientInformation as a vendor-netural synonym for navigator.

The Window object serves as the global object at the top of the scope chain in client-side JavaScript.

The DOM defines a number of ways to select elements; you can query a document for an element or elements:
1.with a specified id attribute;
2.with a specified name attribute;
3.with the specified tag name;
4.with the specified CSS class or classes; or
5.matching the specified CSS selector