January 2010 web platform update

Now available in Chrome

Limited availability

• Array.isArray(): The Array.isArray() static method checks whether a value is an array. Learn more.

• :nth-child() (initial support): The :nth-child() and :nth-last-child() CSS functional pseudo-classes match elements by the relative position of elements (first, second, third, fourth, and so on), counted from the first or last sibling. Learn more.