To enable JavaScript, go into the Settings app on your iPhone, click "Safari," then "Advanced," and swipe the JavaScript button to the right so it appears green. Here's a full breakdown with pictures.

To view our interactive tools properly, you need to be using a Java-enabled browser (Microsoft Internet Explorer v.

Apple's latest Java update requires you periodically enable the Java plug-in manually. Here is how this works in OS X.

From Java 7 Update 10, there's an option in the Security tab of the Settings page to "Enable Java content in the browser" which, when unchecked, stops any Java from running.