On test URL https://test.wikipedia.org/wiki/File:Programmatically_created_crystal.stl the icons for the view and download buttons on a 3d object view don't show in Edge and IE 11 (Windows 10 Creators Update). Everything works once viewer is loaded, but the icons are missing before you get there.
Details:
Browser: Microsoft Edge
Computer Version: Windows 10 Version 1703 (OS Build 15063.608)
MediaWiki Version: 1.31.0-wmf.1 (rMW963972f0e576)