I have to agree with the author based on the experience of developing an extension for it. Safari is sadly way behind Firefox and Chrome in supporting latest features. This has not changed since Safari 5/6 in Lion.
I think the author is saying Safari is new IE in terms that you need to start adding features to your sites (and extensions) that Safari won't support and blame Apple for not catching up, like Microsoft did at the time with IE.
Even Microsoft is planning to duplicate Chrome's extension APIs for Edge.
I think the author is saying Safari is new IE in terms that you need to start adding features to your sites (and extensions) that Safari won't support and blame Apple for not catching up, like Microsoft did at the time with IE.
Even Microsoft is planning to duplicate Chrome's extension APIs for Edge.