Which dictionary publisher first introduced a comprehensive 'word history' feature that traces etymological changes through interactive timelines in their digital product?

In the world of language products, dictionaries have undergone fascinating evolutions to meet changing user needs. From print to digital formats, dictionary publishers have implemented various innovations to stay relevant in an increasingly digital world. This poll tests your knowledge about a significant product development milestone in the dictionary publishing industry that revolutionized how we access language resources.

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Oxford University Press with their 'Historical Thesaurus' integration in 2015
Merriam-Webster with their 'Etymology Explorer' feature in 2013
Cambridge Dictionary's 'Word Evolution' visualization tool in 2016
Collins Dictionary's 'Language Timeline' feature launched in 2014