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LibWeb: Return error on modification of a computed CSS style declaration

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Previously, calling `setProperty` or `removeProperty` from JS on a
CSSStyleDeclaration returned from `getComputedStyle()` would return
null. We now return a NoModificationAllowedError instead, which aligns
our implementation with the specification.
This commit is contained in:
Tim Ledbetter 2024-08-04 22:12:31 +01:00 committed by Andreas Kling
parent 08d60d7521
commit ea68bdef26
Notes: github-actions[bot] 2024-08-05 07:56:40 +00:00 
Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/ea68bdef262
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/964
5 changed files with 51 additions and 4 deletions
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2
Tests/LibWeb/Text/expected/css/CSSStyleDeclaration-modify-computed.txt Normal file
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@ -0,0 +1,2 @@
Calling setProperty() on a computed CSSStyleDeclaration throws error of type: NoModificationAllowedError
Calling removeProperty() on a computed CSSStyleDeclaration throws error of type: NoModificationAllowedError

19
Tests/LibWeb/Text/input/css/CSSStyleDeclaration-modify-computed.html Normal file
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@ -0,0 +1,19 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<script>
test(() => {
try {
document.defaultView.getComputedStyle(document.documentElement, null).setProperty("foo", "bar");
println("FAIL");
} catch (e) {
println(`Calling setProperty() on a computed CSSStyleDeclaration throws error of type: ${e.name}`);
}
try {
document.defaultView.getComputedStyle(document.documentElement, null).removeProperty("foo");
println("FAIL");
} catch (e) {
println(`Calling removeProperty() on a computed CSSStyleDeclaration throws error of type: ${e.name}`);
}
});
</script>

4
Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
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@ -30,8 +30,8 @@ public:
virtual WebIDL::ExceptionOr<void> set_property(PropertyID, StringView css_text, StringView priority = ""sv) = 0; virtual WebIDL::ExceptionOr<void> set_property(PropertyID, StringView css_text, StringView priority = ""sv) = 0;
virtual WebIDL::ExceptionOr<String> remove_property(PropertyID) = 0; virtual WebIDL::ExceptionOr<String> remove_property(PropertyID) = 0;
WebIDL::ExceptionOr<void> set_property(StringView property_name, StringView css_text, StringView priority); virtual WebIDL::ExceptionOr<void> set_property(StringView property_name, StringView css_text, StringView priority);
WebIDL::ExceptionOr<String> remove_property(StringView property_name); virtual WebIDL::ExceptionOr<String> remove_property(StringView property_name);
String get_property_value(StringView property) const; String get_property_value(StringView property) const;
StringView get_property_priority(StringView property) const; StringView get_property_priority(StringView property) const;

28
Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
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@ -569,18 +569,42 @@ Optional<StyleProperty> ResolvedCSSStyleDeclaration::property(PropertyID propert
}; };
} }
static WebIDL::ExceptionOr<void> cannot_modify_computed_property_error(JS::Realm& realm)
{
return WebIDL::NoModificationAllowedError::create(realm, "Cannot modify properties in result of getComputedStyle()"_fly_string);
}
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setproperty // https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setproperty
WebIDL::ExceptionOr<void> ResolvedCSSStyleDeclaration::set_property(PropertyID, StringView, StringView) WebIDL::ExceptionOr<void> ResolvedCSSStyleDeclaration::set_property(PropertyID, StringView, StringView)
{ {
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception. // 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
return WebIDL::NoModificationAllowedError::create(realm(), "Cannot modify properties in result of getComputedStyle()"_fly_string); return cannot_modify_computed_property_error(realm());
}
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setproperty
WebIDL::ExceptionOr<void> ResolvedCSSStyleDeclaration::set_property(StringView, StringView, StringView)
{
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
return cannot_modify_computed_property_error(realm());
}
static WebIDL::ExceptionOr<String> cannot_remove_computed_property_error(JS::Realm& realm)
{
return WebIDL::NoModificationAllowedError::create(realm, "Cannot remove properties from result of getComputedStyle()"_fly_string);
} }
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-removeproperty // https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-removeproperty
WebIDL::ExceptionOr<String> ResolvedCSSStyleDeclaration::remove_property(PropertyID) WebIDL::ExceptionOr<String> ResolvedCSSStyleDeclaration::remove_property(PropertyID)
{ {
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception. // 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
return WebIDL::NoModificationAllowedError::create(realm(), "Cannot remove properties from result of getComputedStyle()"_fly_string); return cannot_remove_computed_property_error(realm());
}
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-removeproperty
WebIDL::ExceptionOr<String> ResolvedCSSStyleDeclaration::remove_property(StringView)
{
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
return cannot_remove_computed_property_error(realm());
} }
String ResolvedCSSStyleDeclaration::serialized() const String ResolvedCSSStyleDeclaration::serialized() const

2
Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h
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@ -24,7 +24,9 @@ public:
virtual Optional<StyleProperty> property(PropertyID) const override; virtual Optional<StyleProperty> property(PropertyID) const override;
virtual WebIDL::ExceptionOr<void> set_property(PropertyID, StringView css_text, StringView priority) override; virtual WebIDL::ExceptionOr<void> set_property(PropertyID, StringView css_text, StringView priority) override;
virtual WebIDL::ExceptionOr<void> set_property(StringView property_name, StringView css_text, StringView priority) override;
virtual WebIDL::ExceptionOr<String> remove_property(PropertyID) override; virtual WebIDL::ExceptionOr<String> remove_property(PropertyID) override;
virtual WebIDL::ExceptionOr<String> remove_property(StringView property_name) override;
virtual String serialized() const override; virtual String serialized() const override;
virtual WebIDL::ExceptionOr<void> set_css_text(StringView) override; virtual WebIDL::ExceptionOr<void> set_css_text(StringView) override;