If you’re using say onclick() and .innerHTML= as part of some inline javascript you may well run into a nested quotes issue. For example, maybe within your .innerHTML=’ you want to give some element an ID – you find you can’t because you need to surround that ID parameter with quotes and you’ve used say double quotes for onclick=” and then single quotes for innerHTML=’

The solution?

You can’t escape the new single or double quotes you want to add for your element inside the innerHTML=’, it doesn’t work.

You need to change your onclick=” to call a new function into which you place your innerHTML=’, freeing you up to then use double quotes within it.