The xlink:arcrole attribute specifies a contextual role for the element and corresponds to the RDF Primer notion of a property.

The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.

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.

The fill() method of Array instances changes all elements within a range of indices in an array to a static value. It returns the modified array.

Quantifiers indicate numbers of characters or expressions to match.

Character classes distinguish kinds of characters such as, for example, distinguishing between letters and digits.

The Object.defineProperty() static method defines a new property directly on an object, or modifies an existing property on an object, and returns the object.

As an XML dialect, SVG is namespaced. It is important to understand the concept of namespaces and how they are used if you plan to author SVG content. Namespaces are essential to user agents that support multiple XML dialects; browsers must be very strict. Taking the time to understand namespaces now will save you from future headaches.

The xChannelSelector attribute indicates which color channel from in2 to use to displace the pixels in in along the x-axis.

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.