LibWeb/SVG: Process script element when its text content changes

Libraries/LibWeb/HTML/Parser/HTMLParser.cpp

@@ -4308,6 +4308,7 @@ void HTMLParser::process_using_the_rules_for_foreign_content(HTMLToken& token)
 
         // If the active speculative HTML parser is null and the user agent supports SVG, then Process the SVG script element according to the SVG rules. [SVG]
         // FIXME: If the active speculative HTML parser is null
+        script_element.set_parser_inserted({});
         script_element.process_the_script_element();
 
         // Decrement the parser's script nesting level by one.

Libraries/LibWeb/SVG/SVGScriptElement.cpp

@@ -35,6 +35,24 @@ void SVGScriptElement::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_script);
 }
 
+void SVGScriptElement::inserted()
+{
+    Base::inserted();
+    if (m_parser_inserted)
+        return;
+
+    process_the_script_element();
+}
+
+void SVGScriptElement::children_changed(ChildrenChangedMetadata const* metadata)
+{
+    Base::children_changed(metadata);
+    if (m_parser_inserted)
+        return;
+
+    process_the_script_element();
+}
+
 // https://www.w3.org/TR/SVGMobile12/script.html#ScriptContentProcessing
 void SVGScriptElement::process_the_script_element()
 {
@@ -114,6 +132,8 @@ void SVGScriptElement::process_the_script_element()
     } else {
         // Inline script content
         script_content = child_text_content();
+        if (script_content.is_empty())
+            return;
     }
 
     // 3. The 'script' element's "already processed" flag is set to true.

Libraries/LibWeb/SVG/SVGScriptElement.h

@@ -21,8 +21,12 @@ class SVGScriptElement
 public:
     void process_the_script_element();
 
+    void set_parser_inserted(Badge<HTML::HTMLParser>) { m_parser_inserted = true; }
     void set_source_line_number(Badge<HTML::HTMLParser>, size_t source_line_number) { m_source_line_number = source_line_number; }
 
+    virtual void inserted() override;
+    virtual void children_changed(ChildrenChangedMetadata const*) override;
+
 protected:
     SVGScriptElement(DOM::Document&, DOM::QualifiedName);
 
@@ -34,6 +38,7 @@ private:
     virtual void visit_edges(Cell::Visitor&) override;
 
     bool m_already_processed { false };
+    bool m_parser_inserted { false };
 
     GC::Ptr<HTML::ClassicScript> m_script;