The conditional (ternary) operator is the only JavaScript operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy. This operator is frequently used as an alternative to an if...else statement.

The URIError object represents an error when a global URI handling function was used in a wrong way.

The cursor attribute specifies the mouse cursor displayed when the mouse pointer is over an element.

The async function declaration creates a binding of a new async function to a given name. The await keyword is permitted within the function body, enabling asynchronous, promise-based behavior to be written in a cleaner style and avoiding the need to explicitly configure promise chains.

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

The k4 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

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

Assigns a class name or set of class names to an element. You may assign the same class name or names to any number of elements, however, multiple class names must be separated by whitespace characters.

The by attribute specifies a relative offset value for an attribute that will be modified during an animation.