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So it seems that PWA means progressive web application [1] and if my very cursory scan is correct it obviously has nothing to do with progressive loading. [1]:

• mbreese 4y ago
  From the page you linked: > Progressive web apps employ the progressive enhancement web development strategy. It isn’t like progressive loading of images (low res first, then high res). Instead the concept focuses on content first and then progressively adding functionality/behavior on top of the content. Dedicated web apps make the progressive loading of behavior a bit fuzzier, especially when the entire point of the site is the behavior. But these PWAs are not necessarily single page apps, so that content can be indexable. https://en.m.wikipedia.org/wiki/Progressive_enhancement https://en.m.wikipedia.org/wiki/Progressive_enhancement