Tests that changing a property is undone properly.

Initial value
[expanded] 
element.style  { ()

======== Matched CSS Rules ========
[expanded] 
.container  { (undo-change-property.html:7)
font-weight: bold;

[expanded] 
div  { (user agent stylesheet)
display: block;


After changing property
[expanded] 
element.style  { ()

======== Matched CSS Rules ========
[expanded] 
.container  { (undo-change-property.html:7)
font-weight: normal;

[expanded] 
div  { (user agent stylesheet)
display: block;


After undo
[expanded] 
element.style  { ()

======== Matched CSS Rules ========
[expanded] 
.container  { (undo-change-property.html:7)
font-weight: bold;

[expanded] 
div  { (user agent stylesheet)
display: block;


After redo
[expanded] 
element.style  { ()

======== Matched CSS Rules ========
[expanded] 
.container  { (undo-change-property.html:7)
font-weight: normal;

[expanded] 
div  { (user agent stylesheet)
display: block;