March 2011 web platform update

Now available in Chrome

Limited availability

• :default: The :default CSS pseudo-class matches the default element in a group of related form controls, such as checkboxes and radio buttons with the checked attribute. Learn more.

Now available in Firefox

Limited availability

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

• background-clip: The background-clip CSS property sets the extent of the background: the padding box, the content box, or the default border box. Learn more.

• :default: The :default CSS pseudo-class matches the default element in a group of related form controls, such as checkboxes and radio buttons with the checked attribute. Learn more.

• MathML: MathML, or the Mathematical Markup Language, describes mathematical notation, such as expressions and formulas. Also known as MathML Core. Learn more.

• <input type="search">: The <input> HTML element with the type="search" attribute represents a text field for search queries, which might be styled differently by the browser. Learn more.

• Typed arrays (initial support): Typed arrays are ordered lists of JavaScript values, where all values are of the same numerical type, such as 8-bit integers or 32-bit floating point numbers. Learn more.

Now available in Firefox for Android

Limited availability

• Array (initial support): Arrays are ordered lists of JavaScript values. Learn more.

• Array find() and findIndex(): The find() and findIndex() methods of arrays and typed arrays search an array for the first item that satisfies a test function. Learn more.

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

• Array iteration methods: Array iteration methods Learn more.

• Array splice(): The array splice() method changes an array in-place. You can use it to delete items, overwrite items, or insert items, starting from an index. Learn more.

• Autofocus: The autofocus HTML attribute gives focus to an element on page load. Learn more.

• background-clip: The background-clip CSS property sets the extent of the background: the padding box, the content box, or the default border box. Learn more.

• :default: The :default CSS pseudo-class matches the default element in a group of related form controls, such as checkboxes and radio buttons with the checked attribute. Learn more.

• font-size-adjust: The font-size-adjust CSS property preserves apparent text size, regardless of the font used, by scaling fonts to the same size with respect to a specific metric, such as x-height. This can help make fallback fonts look the same size. Learn more.

• HTTP/1.1: HTTP/1.1 is a network protocol used by browsers and servers. It has been superseded by HTTP/2 and HTTP/3. Learn more.

• MathML: MathML, or the Mathematical Markup Language, describes mathematical notation, such as expressions and formulas. Also known as MathML Core. 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.

• <input type="search">: The <input> HTML element with the type="search" attribute represents a text field for search queries, which might be styled differently by the browser. Learn more.

• Stable array sort: Stable array sort() function Learn more.

• tabindex: The tabindex HTML attribute make an element focusable, and defines the element's relative ordering for sequential focus navigation. Learn more.

• text-indent: The text-indent CSS property sets the size of the empty space (indentation) at the beginning of lines in a text. Learn more.

• Typed arrays (initial support): Typed arrays are ordered lists of JavaScript values, where all values are of the same numerical type, such as 8-bit integers or 32-bit floating point numbers. Learn more.

• XMLHttpRequest: The XMLHttpRequest API makes HTTP requests. It's the predecessor to fetch(). Also known as XHR. Learn more.