Display doesn't look correct.

[nasrin1748]

Describe the issue/behavior that seems buggy

I am trying to run the example from https://www.eddymens.com/blog/highlightjs-add-line-numbers and when I make the pre tag editable and go to the next line the display doesn't look correct.

Sample Code or Instructions to Reproduce

Expected behavior

I should go to the next line number.

Additional context

[joshgoebel]

Line numbers (and editability) are not features of the core library and thus unsupported here. I willl leave this open a few days to see if any volunteers might want to try to help out.