Verifies that entering poor property value restores original text.

[expanded] 
element.style { ()

[expanded] 
#inspected { (<style>)
    color: blue;

[expanded] 
div { (user agent stylesheet)
    display: block;
    unicode-bidi: isolate;

[expanded] 
element.style { ()

[expanded] 
#inspected { (<style>)
    color: blue;
: ;

[expanded] 
div { (user agent stylesheet)
    display: block;
    unicode-bidi: isolate;