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.

The k1 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

The optional chaining (?.) operator accesses an object's property or calls a function. If the object accessed or function called using this operator is undefined or null, the expression short circuits and evaluates to undefined instead of throwing an error.

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 pathLength attribute lets authors specify a total length for the path, in user units. This value is then used to calibrate the browser's distance calculations with those of the author, by scaling all distance computations using the ratio pathLength / (computed value of path length).