In this example, we use XHTML, SVG, JavaScript, and the DOM to animate a swarm of "motes". These motes are governed by two basic principles. First, each mote tries to move towards the mouse cursor, and second each mote tries to move away from the average mote position. Combined, we get this very natural-looking behavior.

The Math.trunc() static method returns the integer part of a number by removing any fractional digits.

The next() method of AsyncGenerator instances returns the next value in the sequence.

The matchAll() method of String values returns an iterator of all results matching this string against a regular expression, including capturing groups.

The throw() method of Generator instances acts as if a throw statement is inserted in the generator's body at the current suspended position, which informs the generator of an error condition and allows it to handle the error, or perform cleanup and close itself.

The search() method of String values executes a search for a match between a regular expression and this string, returning the index of the first match in the string.

The Iterator() constructor is intended to be used as the superclass of other classes that create iterators. It throws an error when constructed by itself.

The next() method of Generator instances returns an object with two properties done and value. You can also provide a parameter to the next method to send a value to the generator.

The throw() method of AsyncGenerator instances acts as if a throw statement is inserted in the generator's body at the current suspended position, which informs the generator of an error condition and allows it to handle the error, or perform cleanup and close itself.

The return() method of AsyncGenerator instances acts as if a return statement is inserted in the generator's body at the current suspended position, which finishes the generator and allows the generator to perform any cleanup tasks when combined with a try...finally block.