javascript - How to detect certificate issues on the user browser -

javascript - How to detect certificate issues on the user browser -

as using more , more tools 3rd party suppliers on our https website beingness surprised several times changes made our suppliers break security of site witch can result on not wanted browser message user.

the more classic errors forced calls http: contents, blocked , can brake usability of site not result on message user.

other classical error non valid certificate, can happen because certificate no longer valid or because issued non recognized ca on user browser.

this lastly errors ones trying identify way warned every time user gets error can deed asap.

can show me way or if @ to the lowest degree feasible.

thanks,

non valid certificate check fired before browser download javascript site. mean if works - certificate fine or user trust it.

if seek check 3rd party site can seek add together 1 pixel image on page , wait onload onerror events.

javascript security https website ssl-certificate