Test that HTMLLinkElement's disabled attribute is properly cached while set when loading a stylesheet.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
Testing value of 'disabled' prior to load just after setting them
PASS mainSheetLink.sheet is non-null.
PASS alternateSheetLink.sheet is null
PASS mainSheetLink.disabled is true
PASS alternateSheetLink.disabled is false
Testing the values when the alternate sheet is loaded (as this is the only one that has sheet() === null)
PASS mainSheetLink.sheet is non-null.
PASS alternateSheetLink.sheet is non-null.
PASS mainSheetLink.disabled is true
PASS alternateSheetLink.disabled is false
PASS successfullyParsed is true
TEST COMPLETE