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LibWeb/CSS: Serialize @font-face closer to spec

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Read the descriptor style values instead of producing a ParsedFontFace
first, as this means we know if a descriptor is actually present, or
has been defaulted to an initial value. This lets us correctly skip the
unicode-range if it was not explicitly set.

Firefox and Chromium both serialize using the "font-stretch" name,
(which is an alias for font-width) which follows the outdated cssom
spec, so I've done so too to match them.

The one thing that we still do differently in this test is that those
browsers check explicitly if `font-stretch` was set, and ignore when
`font-width` is.

I've also inlined the `serialize_a_local()` function to the one place
it's used. The style value to_string() method was already wrapping the
string in quotes, so calling serialize_a_string() on it was producing
`local("\this mess\"")`. It's clearer what's happening when the code
isn't split up.
This commit is contained in:
Sam Atkins 2025-04-04 12:18:53 +01:00
parent a7f7c2a821
commit ee647616b2
Notes: github-actions[bot] 2025-04-07 09:02:33 +00:00
5 changed files with 33 additions and 114 deletions
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8
Libraries/LibWeb/CSS/StyleValues/FontSourceStyleValue.cpp
View file

@ -24,8 +24,14 @@ String FontSourceStyleValue::to_string(SerializationMode) const
return m_source.visit(
[](Local const& local) {
// local(<family-name>)
// https://www.w3.org/TR/cssom-1/#serialize-a-local
// To serialize a LOCAL means to create a string represented by "local(",
// followed by the serialization of the LOCAL as a string, followed by ")".
StringBuilder builder;
serialize_a_local(builder, local.name->to_string(SerializationMode::Normal));
builder.append("local("sv);
builder.append(local.name->to_string(SerializationMode::Normal));
builder.append(')');
return builder.to_string_without_validation();
},
[this](URL::URL const& url) {