<img id="thecat" 

    srcset = "../images/kitten-large-650.png 650w,
               ../images/kitten-medium-465.png 465w,
               ../images/kitten-small-330.png 330w" 

    sizes =  "(min-width:850px) 650px, 
              (min-width:600px) 465px, 
              330px"

    src = "./images/kitten-large-650.png" 
    
    alt = "Large picture of kitten">