The width attribute defines the horizontal length of an element in the user coordinate system.

A word boundary assertion checks if the current position in the string is a word boundary. A word boundary is where the next character is a word character and the previous character is not a word character, or vice versa.

The JavaScript warning "Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead" occurs when there is a deprecated source map syntax in a JavaScript source.

The JavaScript exception "can't delete non-configurable array element" occurs when it was attempted to shorten the length of an array, but one of the array's elements is non-configurable.

The JavaScript exception "return not in function" occurs when a return statement is called outside of a function.

The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.

The findLast() method of TypedArray instances iterates the typed array in reverse order and returns the value of the first element that satisfies the provided testing function. If no elements satisfy the testing function, undefined is returned. This method has the same algorithm as Array.prototype.findLast().

The Object.getOwnPropertyNames() static method returns an array of all properties (including non-enumerable properties except for those which use Symbol) found directly in a given object.

The y attribute defines a y-axis coordinate in the user coordinate system.

The name data property of a Function instance indicates the function's name as specified when it was created, or it may be either anonymous or '' (an empty string) for functions created anonymously.