CSS transitions are lost after inlining

[josephrocca]

I haven't had time to dive into what's causing this, so I unfortunately don't have a minimal test case, but here's a test using a webpage that has some transitions (https://atomiks.github.io/tippyjs/):

Original webpage:

inliner https://atomiks.github.io/tippyjs/ webpage:

The main logo image is missing because it appears with a transition when the page loads (starts with top:-200px;).

The emoji images are missing too, but I think this is a separate problem because the image elements aren't actually in the inliner-generated HTML at all. I think the actual website adds them dynamically with javascript or something because they don't appear to be there when I use view-source in my browser. Here's the difference:

vs.