Dynamic stylesheet test

1. Add <style> - styleEl.styleSheet.cssText = STUFF : FAIL. Stylesheet is empty
2. All in one - addRule('.foo','{ STUFF }', lastIdx) : FAIL. Adds empty rule
3. Create rule - addRule('.foo','{}', lastIdx) : CORRECT
4. Set width - rule.style.width = '4em'; : FAIL. No reflow
5. Set background - rule.style.background = '#0F0'; FAIL. No reflow
6. Set float - rule.style.styleFloat = 'right'; FAIL. No reflow
7. Set filter - rule.style.filter = 'alpha(opacity=VAL)'; CORRECT, and reflow/repaint applies all previous style changes
8. Set cssText - rule.style.cssText = STUFF (with filter); CORRECT