Code view:

A painting is a person's account of this edit as text, recorded independently of the node mapping - a rendering often has several equally defensible answers where the mapping has one. Deletions and insertions carry no position on the opposite side in a painting, so that panel draws no caret for them.

Before

1:where(.wp-block-post-excerpt){box-sizing:border-box;margin-bottom:var(--wp--style--block-gap);margin-top:var(--wp--style--block-gap)}.wp-block-post-excerpt__excerpt{margin-bottom:0;margin-top:0}.wp-block-post-excerpt__more-text{margin-bottom:0;margin-top:var(--wp--style--block-gap)}.wp-block-post-excerpt__more-link{display:inline-block}

After

1:where(.wp-block-post-excerpt) {
2 box-sizing: border-box;
3 margin-top: var(--wp--style--block-gap);
4 margin-bottom: var(--wp--style--block-gap);
5}
6
7.wp-block-post-excerpt__excerpt {
8 margin-top: 0;
9 margin-bottom: 0;
10}
11
12.wp-block-post-excerpt__more-text {
13 margin-top: var(--wp--style--block-gap);
14 margin-bottom: 0;
15}
16
17.wp-block-post-excerpt__more-link {
18 display: inline-block;
19}

Before

stylesheet
rule_set
selectors
pseudo_class_selector
: ":"
class_name "where"
arguments
( "("
class_selector
. "."
class_name
identifier "wp-block-post-excerpt"
) ")"
block
{ "{"
declaration
property_name "box-sizing"
: ":"
plain_value "border-box"
; ";"
declaration
property_name "margin-bottom"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
; ";"
declaration
property_name "margin-top"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__excerpt"
block
{ "{"
declaration
property_name "margin-bottom"
: ":"
integer_value "0"
; ";"
declaration
property_name "margin-top"
: ":"
integer_value "0"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__more-text"
block
{ "{"
declaration
property_name "margin-bottom"
: ":"
integer_value "0"
; ";"
declaration
property_name "margin-top"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__more-link"
block
{ "{"
declaration
property_name "display"
: ":"
plain_value "inline-block"
} "}"

After

stylesheet
rule_set
selectors
pseudo_class_selector
: ":"
class_name "where"
arguments
( "("
class_selector
. "."
class_name
identifier "wp-block-post-excerpt"
) ")"
block
{ "{"
declaration
property_name "box-sizing"
: ":"
plain_value "border-box"
; ";"
declaration
property_name "margin-top"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
; ";"
declaration
property_name "margin-bottom"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
; ";"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__excerpt"
block
{ "{"
declaration
property_name "margin-top"
: ":"
integer_value "0"
; ";"
declaration
property_name "margin-bottom"
: ":"
integer_value "0"
; ";"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__more-text"
block
{ "{"
declaration
property_name "margin-top"
: ":"
call_expression
function_name "var"
arguments
( "("
plain_value "--wp--style--block-gap"
) ")"
; ";"
declaration
property_name "margin-bottom"
: ":"
integer_value "0"
; ";"
} "}"
rule_set
selectors
class_selector
. "."
class_name
identifier "wp-block-post-excerpt__more-link"
block
{ "{"
declaration
property_name "display"
: ":"
plain_value "inline-block"
; ";"
} "}"