#	Test	FF	O	C	IE (not tested yet)
1	document.styleSheets retrieves a StyleSheetList
2	document.styleSheets is read-only, no exception		NOK
3	document.styleSheets lists all stylesheets applied to the document
4	document.styleSheets retrieves StyleSheet objects		NOK
5	document.styleSheets retrieves CSSStyleSheet objects
6	document.styleSheets implements the item() method
7	document.styleSheets.length is read-only, no exception		NOK
8	document.styleSheets.item() returns null for invalid indexes, -1
9	document.styleSheets.item() returns null for invalid indexes, 100
10	StyleSheet.disabled
11	StyleSheet.href for embedded stylesheet
12	StyleSheet.href for linked stylesheet
13	StyleSheet.href for xml-stylesheet PI		NOK
14	StyleSheet.href is read-only, no exception		NOK
15	StyleSheet.media retrieves a MediaList
16	MediaList.length
17	StyleSheet.ownerNode, embedded stylesheet
18	StyleSheet.ownerNode, linked stylesheet
19	StyleSheet.ownerNode, xml-stylesheet PI
20	StyleSheet.ownerNode is read-only, no exception		NOK
21	StyleSheet.parentStyleSheet
22	StyleSheet.parentStyleSheet is read-only, no exception		NOK