The y2 attribute is used to specify the second y-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the y attribute instead.

The isFinite() function determines whether a value is finite, first converting the value to a number if necessary. A finite number is one that's not NaN or ±Infinity. Because coercion inside the isFinite() function can be surprising, you may prefer to use Number.isFinite().

The <feFuncG> SVG filter primitive defines the transfer function for the green component of the input graphic of its parent <feComponentTransfer> element.

A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function's scope from an inner function. In JavaScript, closures are created every time a function is created, at function creation time.

The <fePointLight> filter primitive defines a light source which allows to create a point light effect. It that can be used within a lighting filter primitive: <feDiffuseLighting> or <feSpecularLighting>.

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

The <feDisplacementMap> SVG filter primitive uses the pixel values from the image from in2 to spatially displace the image from in.

The export declaration is used to export values from a JavaScript module. Exported values can then be imported into other programs with the import declaration or dynamic import. The value of an imported binding is subject to change in the module that exports it — when a module updates the value of a binding that it exports, the update will be visible in its imported value.

The lighting-color attribute defines the color of the light source for lighting filter primitives.

Number values represent floating-point numbers like 37 or -9.25.