Tests that computed styles expand and allow tracing to style rules.

==== Computed style for ID1 ====
[expanded] 
background-attachment: scroll;
    #id1 - initial styles-computed-trace.html:23
background-clip: border-box;
    #id1 - initial styles-computed-trace.html:23
background-color: gray;
    #id1 - gray styles-computed-trace.html:23
    /-- overloaded --/ #id1 - black styles-computed-trace.html:18
    /-- overloaded --/ #id1 - green styles-computed-trace.html:13
background-image: none;
    #id1 - initial styles-computed-trace.html:23
background-origin: padding-box;
    #id1 - initial styles-computed-trace.html:23
background-size: auto;
    #id1 - initial styles-computed-trace.html:23
display: block;
    div - block user agent stylesheet
font-family: Courier;
    #id1 - Courier styles-computed-trace.html:18
    /-- overloaded --/ #id1 - Times styles-computed-trace.html:13
    /-- overloaded --/ body - Arial styles-computed-trace.html:4
text-decoration: underline;
    div - underline styles-computed-trace.html:9

[expanded] 
element.style  { ()


==== Computed style for ID2 ====
[expanded] 
background-color: blue;
    #id2 - blue styles-computed-trace.html:27
display: block;
    div - block user agent stylesheet
font-family: Courier;
    #id2 - Courier styles-computed-trace.html:27
    /-- overloaded --/ #id1 - Courier styles-computed-trace.html:18
    /-- overloaded --/ #id1 - Times styles-computed-trace.html:13
    /-- overloaded --/ body - Arial styles-computed-trace.html:4
text-decoration: underline;
    /-- overloaded --/ #id2 - invalidvalue styles-computed-trace.html:27
    div - underline styles-computed-trace.html:9

[expanded] 
element.style  { ()


==== Style for ID3 ====
[expanded] 
element.style  { ()

======== Matched CSS Rules ========
[expanded] 
button[Attributes Style]  { ()
display: none;