Striker Nuno Da Costa pulled a goal back in the second half for Strasbourg, which stayed in ninth place. Saint-Etienne is three points behind third-place Lyon, with third securing a place in the Champions League qualifying rounds.
In Wednesday's other match, midfielder Valentin Rongier's late penalty was enough to give Nantes a 1-0 win at struggling Caen. The moves Nantes up to 14th while Caen is mired in 19th. Fans of both sides observed a minute's applause for Emiliano Sala and chanted his name. The Argentine striker died when a single-engine aircraft carrying him and pilot David Ibbotson crashed in the English Channel last month.
The plane was flying from Nantes to Cardiff, where Sala was due to start a new career playing for the Premier League club. Sala played half of a season for Caen, on loan from Bordeaux, before joining Nantes in 2015.
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