A closure can be thought of as JavaScript that persists after it has been initialized. Internal state is maintained, such as variable values and event bindings. If there are multiple instances, each has its own memory space so each has its own variables and bindings.

In the beginning days of HTML, every corner was a hard 90-degree angle. Then came rounded corners. Support is growing for more varieties of corners now.

Siri can do much more than make a phone call or open an app, but Apple doesn't tell you all the possibilities. Here are some helpful commands to get started.

A Bookmarklet is a bookmark for your browser that will not simply take you to a new site or page, but will perform JavaScript within the context of the current page. This opens up the potential for a LOT of powerful tools, tailored to your needs.