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.

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

The Math.asin() static method returns the inverse sine (in radians) of a number. That is,

The Error() constructor creates Error objects.

The columnNumber data property of an Error instance contains the column number in the line of the file that raised this error.

The Object.groupBy() static method groups the elements of a given iterable according to the string values returned by a provided callback function. The returned object has separate properties for each group, containing arrays with the elements in the group.

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