The function* declaration creates a binding of a new generator function to a given name. A generator function can be exited and later re-entered, with its context (variable bindings) saved across re-entrances.

The BigInt.asIntN() static method truncates a BigInt value to the given number of least significant bits and returns that value as a signed integer.

The fontsize() method of String values creates a string that embeds this string in a <font> element (<font size="...">str</font>), which causes this string to be displayed in the specified font size.