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allow generated html being rendered in dark mode

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`<meta name="color-scheme" content="light dark" />` is a hint to the browsers
that the page can be rendered in light as well as in dark mode
and that the browser can apply corresponding defaults.

as we do not add css colors on our own,
this is sufficient for letting generated html messasge being rendered
in dark mode.

cmp. https://drafts.csswg.org/css-color-adjust/#color-scheme-prop

closes #4146
This commit is contained in:
B. Petersen
2023-03-12 19:40:37 +01:00
committed by bjoern
parent b14e59c5f3
commit 11ca698139
3 changed files with 52 additions and 13 deletions
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20
src/html.rs
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@@ -292,7 +292,10 @@ mod tests {
assert_eq!(
parser.html,
r##"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
This message does not have Content-Type nor Subject.<br/>
<br/>
</body></html>
@@ -308,7 +311,10 @@ This message does not have Content-Type nor Subject.<br/>
assert_eq!(
parser.html,
r##"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
message with a non-UTF-8 encoding: äöüßÄÖÜ<br/>
<br/>
</body></html>
@@ -325,7 +331,10 @@ message with a non-UTF-8 encoding: äöüßÄÖÜ<br/>
assert_eq!(
parser.html,
r##"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
This line ends with a space and will be merged with the next one due to format=flowed.<br/>
<br/>
This line does not end with a space<br/>
@@ -344,7 +353,10 @@ and will be wrapped as usual.<br/>
assert_eq!(
parser.html,
r##"<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="color-scheme" content="light dark" />
</head><body>
mime-modified should not be set set as there is no html and no special stuff;<br/>
although not being a delta-message.<br/>
test some special html-characters as &lt; &gt; and &amp; but also &quot; and &#x27; :)<br/>