The Math.sqrt() static method returns the square root of a number. That is

The Math.log10() static method returns the base 10 logarithm of a number. That is

The Symbol.iterator static data property represents the well-known symbol @@iterator. The iterable protocol looks up this symbol for the method that returns the iterator for an object. In order for an object to be iterable, it must have an @@iterator key.

The next() method of Generator instances returns an object with two properties done and value. You can also provide a parameter to the next method to send a value to the generator.

The Date.now() static method returns the number of milliseconds elapsed since the epoch, which is defined as the midnight at the beginning of January 1, 1970, UTC.

A capturing group groups a subpattern, allowing you to apply a quantifier to the entire group or use disjunctions within it. It memorizes information about the subpattern match, so that you can refer back to it later with a backreference, or access the information through the match results.

A backreference refers to the submatch of a previous capturing group and matches the same text as that group. For named capturing groups, you may prefer to use the named backreference syntax.

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

The marker-mid attribute defines the arrowhead or polymarker that will be drawn at all interior vertices of the given shape.

The display attribute lets you control the rendering of graphical or container elements.