The constructor method is a special method of a class for creating and initializing an object instance of that class.

The extends keyword is used in class declarations or class expressions to create a class that is a child of another class.

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

The new.target meta-property lets you detect whether a function or constructor was called using the new operator. In constructors and functions invoked using the new operator, new.target returns a reference to the constructor or function that new was called upon. In normal function calls, new.target is undefined.

The accent-height attribute defines the distance from the origin to the top of accent characters, measured by a distance within the font coordinate system.

The <metadata> SVG element adds metadata to SVG content. Metadata is structured information about data. The contents of <metadata> should be elements from other XML namespaces such as RDF, FOAF, etc.

The right shift (>>) operator returns a number or BigInt whose binary representation is the first operand shifted by the specified number of bits to the right. Excess bits shifted off to the right are discarded, and copies of the leftmost bit are shifted in from the left. This operation is also called "sign-propagating right shift" or "arithmetic right shift", because the sign of the resulting number is the same as the sign of the first operand.

The <desc> element provides an accessible, long-text description of any SVG container element or graphics element.

The strict equality (===) operator checks whether its two operands are equal, returning a Boolean result. Unlike the equality operator, the strict equality operator always considers operands of different types to be different.

The bitwise OR (|) operator returns a number or BigInt whose binary representation has a 1 in each bit position for which the corresponding bits of either or both operands are 1.