  In 2022, over half of the web traffic was accessed through mobile devices. By
reducing the energy consumption of mobile web apps, we can not only extend the
battery life of our devices, but also make a significant contribution to energy
conservation efforts. For example, if we could save only 5% of the energy used
by web apps, we estimate that it would be enough to shut down one of the
nuclear reactors in Fukushima. This paper presents a comprehensive overview of
energy-saving experiments and related approaches for mobile web apps, relevant
for researchers and practitioners. To achieve this objective, we conducted a
systematic literature review and identified 44 primary studies for inclusion.
Through the mapping and analysis of scientific papers, this work contributes:
(1) an overview of the energy-draining aspects of mobile web apps, (2) a
comprehensive description of the methodology used for the energy-saving
experiments, and (3) a categorization and synthesis of various energy-saving
approaches.
