Display issue of three-backticks formatted code

Question

I came across an answer on Stack Overflow whose code is formatted with triple backticks (AKA CommonMark / GitHub style / ```), that layouts weirdly:

When I edit the question, the preview looks good:

^{This was tested under Firefox 67 & Chrome 75, connected or not, with or without Chrome plugins activated.}

Answer 1

Code fences weren't supported until January 2019, so any post that used them before then had them rendered as simply inline code. You do need to edit and save in order for the post to be rendered using the new Markdown processor.