test span
  1. mousedown span
  2. mouseup span
  3. click span
  4. mousedown text
  5. focus text
  6. mouseup text
  7. click text
  8. mousedown image
  9. focus image
  10. mouseup image
  11. click image
  12. mousedown textarea
  13. focus textarea
  14. mouseup textarea
  15. click textarea