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diff --git a/Userland/Libraries/LibGemini/Document.h b/Userland/Libraries/LibGemini/Document.h
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+++ b/Userland/Libraries/LibGemini/Document.h
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+/*
+ * Copyright (c) 2020, The SerenityOS developers.
+ * 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 <AK/Forward.h>
+#include <AK/NonnullOwnPtrVector.h>
+#include <AK/String.h>
+#include <AK/URL.h>
+#include <AK/Vector.h>
+
+namespace Gemini {
+
+class Line {
+public:
+    Line(String string)
+        : m_text(move(string))
+    {
+    }
+
+    virtual ~Line();
+
+    virtual String render_to_html() const = 0;
+
+protected:
+    String m_text;
+};
+
+class Document : public RefCounted<Document> {
+public:
+    String render_to_html() const;
+
+    static NonnullRefPtr<Document> parse(const StringView& source, const URL&);
+
+    const URL& url() const { return m_url; };
+
+private:
+    explicit Document(const URL& url)
+        : m_url(url)
+    {
+    }
+
+    void read_lines(const StringView&);
+
+    NonnullOwnPtrVector<Line> m_lines;
+    URL m_url;
+    bool m_inside_preformatted_block { false };
+    bool m_inside_unordered_list { false };
+};
+
+class Text : public Line {
+public:
+    Text(String line)
+        : Line(move(line))
+    {
+    }
+    virtual ~Text() override;
+    virtual String render_to_html() const override;
+};
+
+class Link : public Line {
+public:
+    Link(String line, const Document&);
+    virtual ~Link() override;
+    virtual String render_to_html() const override;
+
+private:
+    URL m_url;
+    String m_name;
+};
+
+class Preformatted : public Line {
+public:
+    Preformatted(String line)
+        : Line(move(line))
+    {
+    }
+    virtual ~Preformatted() override;
+    virtual String render_to_html() const override;
+};
+
+class UnorderedList : public Line {
+public:
+    UnorderedList(String line)
+        : Line(move(line))
+    {
+    }
+    virtual ~UnorderedList() override;
+    virtual String render_to_html() const override;
+};
+
+class Control : public Line {
+public:
+    enum Kind {
+        UnorderedListStart,
+        UnorderedListEnd,
+        PreformattedStart,
+        PreformattedEnd,
+    };
+    Control(Kind kind)
+        : Line("")
+        , m_kind(kind)
+    {
+    }
+    virtual ~Control() override;
+    virtual String render_to_html() const override;
+
+private:
+    Kind m_kind;
+};
+
+class Heading : public Line {
+public:
+    Heading(String line, int level)
+        : Line(move(line))
+        , m_level(level)
+    {
+    }
+    virtual ~Heading() override;
+    virtual String render_to_html() const override;
+
+private:
+    int m_level { 1 };
+};
+
+}