Add printing WPT test for fixedpos and variable page size.
Fixed-positioned elements are positioned within the initial containing
block, which, for pagination, is defined as the page area size of the
first page. Even if the first page isn't large enough for the
fixed-positioned element, subsequent pages may be large enough.
This test passes in Blink.
Change-Id: I49fdc8d735a126ff928e6098c733e9fe053f80fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5499460
Reviewed-by: Ian Kilpatrick ikilpatrick@chromium.org
Commit-Queue: Morten Stenshorne mstensho@chromium.org
Cr-Commit-Position: refs/heads/main@{#1294362}