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 font-size-adjust attribute allows authors to specify an aspect value for an element that will preserve the x-height of the first choice font in a substitute font.

The var statement declares function-scoped or globally-scoped variables, optionally initializing each to a value.

The TypeError object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type.

The this keyword refers to the context where a piece of code, such as a function's body, is supposed to run. Most typically, it is used in object methods, where this refers to the object that the method is attached to, thus allowing the same method to be reused on different objects.

SVG elements can be modified using attributes that specify details about exactly how the element should be handled or rendered.

The <foreignObject> SVG element includes elements from a different XML namespace. In the context of a browser, it is most likely (X)HTML.

The <feDropShadow> SVG filter primitive creates a drop shadow of the input image. It can only be used inside a <filter> element.

The kernelUnitLength attribute has two meanings based on the context it's used in. For lighting filter primitives, it indicates the intended distance for the x and y coordinates, for <feConvolveMatrix>, it indicates the intended distance between successive columns and rows in the kernel matrix.

The Uint16Array typed array represents an array of 16-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).