June 2009 web platform update

Now available in Firefox
Limited availability

Canvas text metrics: The fillText() and strokeText() methods draw text to a 2D canvas. The measureText() method measures the width and other metrics which can be used to position the text. 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.

Array iteration methods: Array iteration methods Learn more.
Autofocus: The autofocus HTML attribute gives focus to an element on page load. Learn more.
Canvas text metrics: The fillText() and strokeText() methods draw text to a 2D canvas. The measureText() method measures the width and other metrics which can be used to position the text. Learn more.
:read-only and :read-write: The :read-only and :read-write CSS pseudo-classes match elements that are read-only or read-write, respectively. For example, :read-only matches <input> and <textarea> elements with the readonly attribute. Learn more.
tabindex: The tabindex HTML attribute make an element focusable, and defines the element's relative ordering for sequential focus navigation. Learn more.

zoom: The zoom CSS property scales the size of an element. Unlike the transform property, a zoomed element affects page layout. Learn more.