LibWeb: Add a barebones SVGTextContentElement with getNumberOfChars()

Userland/Libraries/LibWeb/SVG/SVGTextContentElement.cpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Utf16View.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/SVG/SVGTextContentElement.h>
+
+namespace Web::SVG {
+
+SVGTextContentElement::SVGTextContentElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : SVGGraphicsElement(document, move(qualified_name))
+{
+}
+
+// https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getNumberOfChars
+int SVGTextContentElement::get_number_of_chars() const
+{
+    return AK::utf8_to_utf16(child_text_content()).size();
+}
+
+}