Error found on production wiki: https://en.wikipedia.org/wiki/Bernoulli_number?mpo=minerva-toc-sticky:treatment#Reconstruction_of_%22Summ%C3%A6_Potestatum%22

DOMException: Element.querySelector: 'a[href="#Reconstruction_of_"Summæ_Potestatum""]' is not a valid selector

Steps to test:

• go to a page with a section header that has special characters eg. == Reconstruction of "Summæ Potestatum" == section on Bernoulli number
• activate page with ?mpo=minerva-toc-sticky:treatment
• scroll until the Reconstruction of "Summæ Potestatum" appears as the active/sticky section
• click the TOC button on the sticky heading

Expected behavior:

• should not show JS errors in console
• should highlight the Reconstruction of "Summæ Potestatum" section in the TOC