The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.

Event attributes always have their name starting with "on" followed by the name of the event for which they are intended. They specifies some script to run when the event of the given type is dispatched to the element on which the attributes are specified.

The edgeMode attribute determines how to extend the input image as necessary with color values so that the matrix operations can be applied when the kernel is positioned at or near the edge of the input image.

The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement.

The patternContentUnits attribute indicates which coordinate system to use for the contents of the <pattern> element.

An object initializer is a comma-delimited list of zero or more pairs of property names and associated values of an object, enclosed in curly braces ({}). Objects can also be initialized using Object.create() or by invoking a constructor function with the new operator.

The exponentiation assignment (**=) operator performs exponentiation on the two operands and assigns the result to the left operand.

The radius attribute represents the radius (or radii) for the operation on a given <feMorphology> filter primitive.

The orientation attribute indicates that the given glyph is only to be used for a particular text direction, i.e. horizontal or vertical.

Private properties are counterparts of the regular class properties which are public, including class fields, class methods, etc. Private properties get created by using a hash # prefix and cannot be legally referenced outside of the class. The privacy encapsulation of these class properties is enforced by JavaScript itself. The only way to access a private property is via dot notation, and you can only do so within the class that defines the private property.