Please answer a question about the following article about Catalan language:

In the Balearic Islands, IEC's standard is used but adapted for the Balearic dialect by the University of the Balearic Islands's philological section. In this way, for instance, IEC says it is correct writing cantam as much as cantem ('we sing') but the University says that the priority form in the Balearic Islands must be "cantam" in all fields. Another feature of the Balearic standard is the non-ending in the 1st person singular present indicative: jo compr ('I buy'), jo tem ('I fear'), jo dorm ('I sleep').

What is a first person singular  feature of the Balearic standard?
non-ending