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diff --git a/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
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+++ b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
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+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/StringBuilder.h>
+#include <LibWeb/CSS/Parser/CSSParser.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/DOM/Text.h>
+#include <LibWeb/HTML/HTMLStyleElement.h>
+
+namespace Web::HTML {
+
+HTMLStyleElement::HTMLStyleElement(DOM::Document& document, const QualifiedName& qualified_name)
+    : HTMLElement(document, qualified_name)
+{
+}
+
+HTMLStyleElement::~HTMLStyleElement()
+{
+}
+
+void HTMLStyleElement::children_changed()
+{
+    StringBuilder builder;
+    for_each_child([&](auto& child) {
+        if (is<DOM::Text>(child))
+            builder.append(downcast<DOM::Text>(child).text_content());
+    });
+    m_stylesheet = parse_css(CSS::ParsingContext(document()), builder.to_string());
+    if (m_stylesheet)
+        document().style_sheets().add_sheet(*m_stylesheet);
+    else
+        document().style_sheets().add_sheet(CSS::StyleSheet::create({}));
+    HTMLElement::children_changed();
+}
+
+void HTMLStyleElement::removed_from(Node& old_parent)
+{
+    if (m_stylesheet) {
+        // FIXME: Remove the sheet from the document
+    }
+    return HTMLElement::removed_from(old_parent);
+}
+
+}