I am trying to understand 'pause' and 'resume' for D3 transitions from this guide. While I understand how 'pause' is working, I am little lost when it comes to 'resume'. I couldn't make sense of the author's explanation, specifically the 'linear' or first resume explanation. My question is what is e.attr("T",0); and .attr("T",1); doing exactly?

I am applying the resume functionality to a playhead for video or waveform example here: jsfiddle

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