I have error line 19. Thanks you sir.

Question

I want to display content img. Error line 19.
https://code.sololearn.com/Wf0AHV44L8U9/?ref=app

Answer 1

Your selector list is not a string.

var el = document.querySelectorAll ( ".first, .second, .third, img" );

Tag your question properly

https://code.sololearn.com/W3uiji9X28C1/?ref=app