Since python 3.5 we're converting HTML characters and we shouldn't: https://docs.python.org/3/library/html.parser.html
Created attachment 426191 [details] Patch
Created attachment 426192 [details] Patch
Committed r276128 (236623@main): <https://commits.webkit.org/236623@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 426192 [details].
<rdar://problem/77110133>