Assertion: browser's extension | /r/HasProperty | released as working drafts
Facets:
value: for standardization
type: PURPOSE
Source sentences:
text: Beginning in early 2007, the development team began to implement Cascading Style Sheets (CSS) extensions, including animation, transitions and both 2D and 3D transforms; such extensions were released as working drafts to the World Wide Web Consortium (W3C) in 2009 for standardization.