LibWeb: Implement Element.insertAdjacentText

Userland/Libraries/LibWeb/DOM/Element.cpp

@@ -891,4 +891,16 @@ WebIDL::ExceptionOr<JS::GCPtr<Element>> Element::insert_adjacent_element(String
     return JS::GCPtr<Element> { verify_cast<Element>(*returned_node) };
 }
 
+// https://dom.spec.whatwg.org/#dom-element-insertadjacenttext
+WebIDL::ExceptionOr<void> Element::insert_adjacent_text(String const& where, String const& data)
+{
+    // 1. Let text be a new Text node whose data is data and node document is this’s node document.
+    JS::NonnullGCPtr<Text> text = *heap().allocate<DOM::Text>(realm(), document(), data);
+
+    // 2. Run insert adjacent, given this, where, and text.
+    // Spec Note: This method returns nothing because it existed before we had a chance to design it.
+    (void)TRY(insert_adjacent(where, move(text)));
+    return {};
+}
+
 }

Userland/Libraries/LibWeb/DOM/Element.h

@@ -145,6 +145,7 @@ public:
     bool is_actually_disabled() const;
 
     WebIDL::ExceptionOr<JS::GCPtr<Element>> insert_adjacent_element(String const& where, JS::NonnullGCPtr<Element> element);
+    WebIDL::ExceptionOr<void> insert_adjacent_text(String const& where, String const& data);
 
 protected:
     Element(Document&, DOM::QualifiedName);

Userland/Libraries/LibWeb/DOM/Element.idl

@@ -54,6 +54,7 @@ interface Element : Node {
     readonly attribute long clientHeight;
 
     [CEReactions] Element? insertAdjacentElement(DOMString where, Element element);
+    undefined insertAdjacentText(DOMString where, DOMString data);
     [CEReactions] undefined insertAdjacentHTML(DOMString position, DOMString text);
 };