The bitwise OR assignment operator (|=) uses the binary representation of both operands, does a bitwise OR operation on them and assigns the result to the variable.

The dx attribute indicates a shift along the x-axis on the position of an element or its content.

The dy attribute indicates a shift along the y-axis on the position of an element or its content.

The multiplication assignment operator (*=) multiplies a variable by the value of the right operand and assigns the result to the variable.

Symbol is a built-in object whose constructor returns a symbol primitive — also called a Symbol value or just a Symbol — that's guaranteed to be unique. Symbols are often used to add unique property keys to an object that won't collide with keys any other code might add to the object, and which are hidden from any mechanisms other code will typically use to access the object. That enables a form of weak encapsulation, or a weak form of information hiding.

The x attribute defines an x-axis coordinate in the user coordinate system.

The JavaScript delete operator removes a property from an object; if no more references to the same property are held, it is eventually released automatically.

The <feDistantLight> filter primitive defines a distant light source that can be used within a lighting filter primitive: <feDiffuseLighting> or <feSpecularLighting>.

JavaScript supports a compact set of statements, specifically control flow statements, that you can use to incorporate a great deal of interactivity in your application. This chapter provides an overview of these statements.

The increment operator (++) increments (adds one to) its operand and returns a value.