What is this obfuscated script doing here?

Viruses and worms
1

See: https://webcookies.org/cookies/caniuse.com/34988
Nothing here: https://www.urlvoid.com/scan/caniuse.com/
JavaScript error: ReferenceError: _bsa is not defined
/:70
No retirable libraries as far as I can check with Retire.JS
Avast detects two tracking systems - adtracking and web analysis tracking…

See: https://toolbar.netcraft.com/site_report?url=https://caniuse.com

DOM-XSS scan: Results from scanning URL: -https://caniuse.com
Number of sources found: 4
Number of sinks found: 569
&
Results from scanning URL: -https://caniuse.com/js/bundle.js?1562363948
Number of sources found: 100
Number of sinks found: 44

Re: https://aw-snap.info/file-viewer/?protocol=secure&ref_sel=GSP2&ua_sel=ff&chk-cache=&fs=1&tgt=XnxuW3Vzey5eXW0%3D~enc

This was prevented from loading by adblock: -http://m.servedby-buysellads.com/monetization.js *

Website was built using React, linting the site produces:
https://webhint.io/scanner/7c99327b-40b8-42f9-a05b-f609bfeb9cee

polonus (volunteer 3rd party cold reconnaissance website security analyst and website error-hunter)