link.disabled initial value: true
document.styleSheets.length initial value: 0
background color when link is disabled: rgba(0, 0, 0, 0)
onload event fired
link.disabled: false
document.styleSheets.length: 1
background color: rgb(0, 128, 0)
sheet.ownerNode is link element: true
document.styleSheets.length after link disabled again: 0
link.disabled after link disabled again: true
background color after link disabled again: rgba(0, 0, 0, 0)
sheet.ownerNode is null: true