some things are not exported with correct positions and rotations.
might be related to instanced components or rotated groups.
also, xd shows and exports the 1px lines as 1px sharp, the exported html/css shows them as 2px lines. might be due to xd snapping them to the closest pixel.
example file with export settings & screenshots:
webExportTest.zip (89.1 KB)
adobe xd 22.214.171.124, confirmed on 126.96.36.199
windows 10 version 1809