Tottenham were on course for only their second Premier League win in nine years at Arsenal but ended up clinging on for a point.
Christian Eriksen's 50th Premier League goal and Harry Kane's penalty, his 10th in north London derbies, had Spurs cruising against the run of play.
But, the Gunners fought back as Alexandre Lacazette pulled one back in first-half stoppage time before Pierre-Emerick Aubameyang equalised in an enthralling second half.
Davinson Sanchez struggled at right-back, helped out by Moussa Sissoko with mixed results, but Harry Winks was much improved after last weekend's frustrating 1-0 home loss to Newcastle.
Jan Vertonghen and Dele Alli were given their first minutes of the season, while Giovani Lo Celso looked bright in a brief second-half cameo.
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Additional reporting by the Press Association.
