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diff --git a/Libraries/LibWeb/Layout/FormattingContext.h b/Libraries/LibWeb/Layout/FormattingContext.h
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+++ b/Libraries/LibWeb/Layout/FormattingContext.h
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+/*
+ * Copyright (c) 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.
+ */
+
+#pragma once
+
+#include <LibWeb/Forward.h>
+
+namespace Web::Layout {
+
+class FormattingContext {
+public:
+    virtual void run(LayoutMode) = 0;
+
+    LayoutBox& context_box() { return m_context_box; }
+    const LayoutBox& context_box() const { return m_context_box; }
+
+
+protected:
+    FormattingContext(LayoutBox&);
+    virtual ~FormattingContext();
+
+    static void layout_inside(LayoutBox&, LayoutMode);
+
+    struct ShrinkToFitResult {
+        float preferred_width { 0 };
+        float preferred_minimum_width { 0 };
+    };
+
+    ShrinkToFitResult calculate_shrink_to_fit_widths(LayoutBox&);
+
+    LayoutBox& m_context_box;
+};
+
+}