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LibWeb: Allow cloneNode() to clone elements with weird attributes

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We can't rely on Element.setAttribute() in cloneNode() since that will
throw on weird attribute names. Instead, just follow the spec and copy
attributes into cloned elements verbatim.

This fixes a crash when loading the "issues" tab on GitHub repos.
They are actually sending us unintentionally broken markup, but we
should still support cloning it. :^)
This commit is contained in:
Andreas Kling 2024-04-21 18:16:27 +02:00
commit 193fc7ef98
Notes: sideshowbarker 2024-07-17 11:29:41 +09:00
5 changed files with 19 additions and 1 deletions
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2
Tests/LibWeb/Text/expected/DOM/cloneNode-with-goofy-attribute.txt Normal file
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@ -0,0 +1,2 @@
a(
a(

9
Tests/LibWeb/Text/input/DOM/cloneNode-with-goofy-attribute.html Normal file
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@ -0,0 +1,9 @@
<script src="../include.js"></script>
<svg><circle id=c a(></svg>
<script>
test(() => {
let cloned = c.cloneNode()
println(c.attributes[1].localName)
println(cloned.attributes[1].localName)
});
</script>

6
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -246,6 +246,12 @@ WebIDL::ExceptionOr<void> Element::set_attribute_ns(Optional<FlyString> const& n
return {};
}
// https://dom.spec.whatwg.org/#concept-element-attributes-append
void Element::append_attribute(FlyString const& name, String const& value)
{
m_attributes->append_attribute(Attr::create(document(), name, value));
}
// https://dom.spec.whatwg.org/#concept-element-attributes-append
void Element::append_attribute(Attr& attribute)
{

1
Userland/Libraries/LibWeb/DOM/Element.h
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@ -109,6 +109,7 @@ public:
WebIDL::ExceptionOr<JS::GCPtr<Attr>> set_attribute_node(Attr&);
WebIDL::ExceptionOr<JS::GCPtr<Attr>> set_attribute_node_ns(Attr&);
void append_attribute(FlyString const& name, String const& value);
void append_attribute(Attr&);
void remove_attribute(FlyString const& name);
void remove_attribute_ns(Optional<FlyString> const& namespace_, FlyString const& name);

2
Userland/Libraries/LibWeb/DOM/Node.cpp
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@ -826,7 +826,7 @@ JS::NonnullGCPtr<Node> Node::clone_node(Document* document, bool clone_children)
element.for_each_attribute([&](auto& name, auto& value) {
// 1. Let copyAttribute be a clone of attribute.
// 2. Append copyAttribute to copy.
MUST(element_copy->set_attribute(name, value));
element_copy->append_attribute(name, value);
});
copy = move(element_copy);