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

==== Computed style for ID1 ====
display: block;
    block - div user agent stylesheet
[expanded] 
element.style { ()

[expanded] 
#id1 { (<style>)
    --b: 44px;

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

======== Inherited from body ========
[expanded] 
body { (<style>)
    --a: red;

value of --a:  red
==== Computed style for ID2 ====
display: block;
    block - div user agent stylesheet
[expanded] 
element.style { ()

[expanded] 
#id2 { (<style>)
    --a: green;

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

======== Inherited from div#id1 ========
[expanded] 
#id1 { (<style>)
    --b: 44px;

======== Inherited from body ========
[expanded] 
body { (<style>)
/-- overloaded --/     --a: red;

value of --b:  44px
==== Computed style for ID3 ====
display: block;
    block - div user agent stylesheet
[expanded] 
element.style { ()

[expanded] 
#id3 { (<style>)
    --a: inherit;

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

======== Inherited from div#id2 ========
[expanded] 
#id2 { (<style>)
/-- overloaded --/     --a: green;

======== Inherited from div#id1 ========
[expanded] 
#id1 { (<style>)
    --b: 44px;

======== Inherited from body ========
[expanded] 
body { (<style>)
/-- overloaded --/     --a: red;

value of --b:  44px
==== Computed style for ID4 ====
display: block;
    block - div user agent stylesheet
[expanded] 
element.style { ()

[expanded] 
#id4 { (<style>)
    --a: var(--z);

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

======== Inherited from body ========
[expanded] 
body { (<style>)
/-- overloaded --/     --a: red;

value of --a:  red
==== Computed style for ID5 ====
display: block;
    block - div user agent stylesheet
[expanded] 
element.style { ()

[expanded] 
#id5 { (<style>)
    --a: var(--b);
    --b: var(--a);

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

======== Inherited from body ========
[expanded] 
body { (<style>)
/-- overloaded --/     --a: red;

value of --a: undefined