# Web Runtime standards

This section describes the standards supported by Web Runtime. For information about the features that you can build into widgets using Web Runtime, see section Web Runtime features.

Web Runtime 1.0 and later support the following Internet technology standards:

- HTML 4.01 Specification, W3C Recommendation 24 December 1999,

- XHTML Mobile Profiles Specification, XHTML Mobile Profile Version 29-Oct-2001, WAP-277-XHTMLMP-20011029-a

- CSS Level 2 revision 1 (CSS 2.1), WAP CSS Specification Version 26-Oct-2001, WAP-239-WCSS-20011026-a

- JavaScript 1.5 (ECMA-262 3rd Edition), ECMAScript Language Specification, 3rd edition (December 1999)

- The combination of XML, XHTML/HTML, CSS, DOM, and the XMLHttpRequest object to add Ajax capability to a widget