The refY attribute defines the y coordinate of an element's reference point.

The with statement extends the scope chain for a statement.

The JavaScript error "unterminated string literal" occurs when there is an unterminated string literal somewhere. String literals must be enclosed by single (') or double (") quotes.

The xlink:show attribute indicates how a linked resource should be opened and is meant for XLink-aware processors. In case of a conflict, the target attribute has priority, since it can express a wider range of values.

The units-per-em attribute specifies the number of coordinate units on the "em square", an abstract square whose height is the intended distance between lines of type in the same type size. This is the size of the design grid on which glyphs are laid out.

The copyWithin() method of Array instances shallow copies part of this array to another location in the same array and returns this array without modifying its length.

The values() method of Array instances returns a new array iterator object that iterates the value of each item in the array.

The rest parameter syntax allows a function to accept an indefinite number of arguments as an array, providing a way to represent variadic functions in JavaScript.

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The for await...of statement creates a loop iterating over async iterable objects as well as sync iterables. This statement can only be used in contexts where await can be used, which includes inside an async function body and in a module.