Can't seem to get this to work. Currently only the full-size img (soho-w920h665) loads. What I'm trying to do: the img spans 100vw until window width is 766px or bigger, then the img spans only 50vw.
<img
srcset="/img/soho-w500h361.jpg 500,
/img/soho-w700h605.jpg 700,
/img/soho-w920h665.jpg 920"
sizes="(min-width : 766px) 50vw,
data-src="/img/soho-w920h665.jpg
">