Leeds United took advantage of Norwich's slip-up at Preston by beating Swansea to return to the top of the championship.
Leeds defender Pontus Jansson celebrated his 28th birthday with the first goal on Elland Road. He responded first to the blocked shot from Ezgjan Alioski to shoot from 12 yards into the bottom corner.
Alioski also provided Leeds' second goal for Jack Harrison, who nodded past Erwin Mulder at his near post just one minute after the Swansea goalkeeper had staved off his powerful instinct.
Oli McBurnie's penalty gave Swansea late hope after Joel Asoro's clumsy foul on Luke Ayling, but Leeds won a point from Norwich, who lost 3-1 at Deepdale.
Clear Swansea chances were close, but shortly before the break they came close when Matt Grimes's deflected free-kick hit the post.
Winger Daniel James, who nearly stormed to Leeds in January, was caught up in the set-piece on the edge of the box. Otherwise, he was kept relatively calm by the hosts' defense before being substituted after 67 minutes.
Leeds has stalled in seven games in a row in November and December, and victory in this game could have been over long before McBurnies. Patrick Bamford and Kemar Roofe were able to extend the lead of the home side almost.
However, their two goals in the first half were enough to keep them three points clear of third-placed Sheffield United.
They have a 10-day break until the next home game against Bolton on 23 February, while Swansea is in the fifth round of the FA Cup on Sunday when Brentford championship club visits Liberty Stadium.
Leeds head coach Marcelo Bielsa told BBC Radio Leeds:
"We deserve the win, it's hard to understand that we only won with one goal because we dominated the game and had plenty of chances.
"The players have a four-day break from Thursday to Sunday and we'll use this time to recover well."