The font-variant attribute indicates whether the text is to be rendered using variations of the font's glyphs.

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 logical AND assignment (&&=) operator only evaluates the right operand and assigns to the left if the left operand is truthy.

The unary negation (-) operator precedes its operand and negates it.

A named backreference refers to the submatch of a previous named capturing group and matches the same text as that group. For unnamed capturing groups, you need to use the normal backreference syntax.

The right shift assignment (>>=) operator performs right shift on the two operands and assigns the result to the left operand.

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 set syntax binds an object property to a function to be called when there is an attempt to set that property. It can also be used in classes.

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The increment (++) operator increments (adds one to) its operand and returns the value before or after the increment, depending on where the operator is placed.