diff --git a/Userland/Libraries/LibWeb/DOM/Position.cpp b/Userland/Libraries/LibWeb/DOM/Position.cpp
index 4bd0135a23..155e94ecbe 100644
--- a/Userland/Libraries/LibWeb/DOM/Position.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Position.cpp
@@ -1,11 +1,14 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Utf8View.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/DOM/Position.h>
+#include <LibWeb/DOM/Text.h>
 
 namespace Web::DOM {
 
@@ -26,4 +29,56 @@ String Position::to_string() const
     return String::formatted("DOM::Position({} ({})), {})", node()->node_name(), node(), offset());
 }
 
+bool Position::increment_offset()
+{
+    if (!is<DOM::Text>(*m_node))
+        return false;
+
+    auto& node = downcast<DOM::Text>(*m_node);
+    auto text = Utf8View(node.data());
+
+    for (auto iterator = text.begin(); !iterator.done(); ++iterator) {
+        if (text.byte_offset_of(iterator) >= m_offset) {
+            // NOTE: If the current offset is inside a multi-byte codepoint, it will be moved to the start of the next codepoint.
+            m_offset = text.byte_offset_of(++iterator);
+            return true;
+        }
+    }
+    // NOTE: Already at end of current node.
+    return false;
+}
+
+bool Position::decrement_offset()
+{
+    if (m_offset == 0 || !is<DOM::Text>(*m_node))
+        return false;
+
+    auto& node = downcast<DOM::Text>(*m_node);
+    auto text = Utf8View(node.data());
+
+    size_t last_smaller_offset = 0;
+
+    for (auto iterator = text.begin(); !iterator.done(); ++iterator) {
+        auto byte_offset = text.byte_offset_of(iterator);
+        if (byte_offset >= m_offset) {
+            break;
+        }
+        last_smaller_offset = text.byte_offset_of(iterator);
+    }
+
+    // NOTE: If the current offset is inside a multi-byte codepoint, it will be moved to the start of that codepoint.
+    m_offset = last_smaller_offset;
+    return true;
+}
+
+bool Position::offset_is_at_end_of_node() const
+{
+    if (!is<DOM::Text>(*m_node))
+        return false;
+
+    auto& node = downcast<DOM::Text>(*m_node);
+    auto text = node.data();
+    return m_offset == text.length();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Position.h b/Userland/Libraries/LibWeb/DOM/Position.h
index 78206fefaa..73dd703da0 100644
--- a/Userland/Libraries/LibWeb/DOM/Position.h
+++ b/Userland/Libraries/LibWeb/DOM/Position.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -25,7 +26,10 @@ public:
     const Node* node() const { return m_node; }
 
     unsigned offset() const { return m_offset; }
+    bool offset_is_at_end_of_node() const;
     void set_offset(unsigned value) { m_offset = value; }
+    bool increment_offset();
+    bool decrement_offset();
 
     bool operator==(const Position& other) const
     {
diff --git a/Userland/Libraries/LibWeb/Page/Frame.cpp b/Userland/Libraries/LibWeb/Page/Frame.cpp
index 31e3d42417..0d130f2fa8 100644
--- a/Userland/Libraries/LibWeb/Page/Frame.cpp
+++ b/Userland/Libraries/LibWeb/Page/Frame.cpp
@@ -297,4 +297,20 @@ bool Frame::is_frame_nesting_allowed(URL const& url) const
     return m_frame_nesting_levels.get(url).value_or(0) < 3;
 }
 
+bool Frame::increment_cursor_position_offset()
+{
+    if (!m_cursor_position.increment_offset())
+        return false;
+    reset_cursor_blink_cycle();
+    return true;
+}
+
+bool Frame::decrement_cursor_position_offset()
+{
+    if (!m_cursor_position.decrement_offset())
+        return false;
+    reset_cursor_blink_cycle();
+    return true;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/Page/Frame.h b/Userland/Libraries/LibWeb/Page/Frame.h
index daac863581..8a0346d0b7 100644
--- a/Userland/Libraries/LibWeb/Page/Frame.h
+++ b/Userland/Libraries/LibWeb/Page/Frame.h
@@ -74,6 +74,8 @@ public:
 
     const DOM::Position& cursor_position() const { return m_cursor_position; }
     void set_cursor_position(DOM::Position);
+    bool increment_cursor_position_offset();
+    bool decrement_cursor_position_offset();
 
     bool cursor_blink_state() const { return m_cursor_blink_state; }