Chelsea thought they had survived some nervy moments against Everton, but the Champions League quarter-finalists got pegged back by a last-gasp equaliser from youngster Ellis Simms.
The Blues looked to prolong their winning run, but Everton held firm for the opening 45 minutes to send the two teams in level at half-time. The impressive Joao Felix eventually broke down the visitors, scoring his first Stamford Bridge goal to break the deadlock early in the second half.
Christian Pulisic thought he'd doubled the lead, only for an offside in the build-up, and Everton grabbed a vital equaliser when James Tarkowski's header was nodded over the line by Abdoulaye Doucoure. The hosts' lead was restored minutes later, though, with Kai Havertz converting from the penalty spot after Reece James was fouled, but they couldn't hold on as Simms fired in his late leveller
