The multiplication assignment (*=) operator performs multiplication on the two operands and assigns the result to the left operand.

The new operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function.

The elevation attribute specifies the direction angle for the light source from the XY plane towards the Z-axis, in degrees. Note that the positive Z-axis points towards the viewer of the content.

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

The d attribute defines a path to be drawn.

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 horiz-adv-x attribute indicates the horizontal advance after rendering a glyph in horizontal orientation.

The logical OR (||) (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. It is typically used with boolean (logical) values. When it is, it returns a Boolean value. However, the || operator actually returns the value of one of the specified operands, so if this operator is used with non-Boolean values, it will return a non-Boolean value.

The break statement terminates the current loop or switch statement and transfers program control to the statement following the terminated statement. It can also be used to jump past a labeled statement when used within that labeled statement.

The async function* declaration creates a binding of a new async generator function to a given name.