As the document of quill said, I add the highlight.js in my page.Well, no matter where I put the library in my html file, it always run out with the issue: Error: Syntax module requires highlight.js. Please include the library on the page before Quill., I searched a lot, but with no luck. Sorry, I know here isn't the place to ask question like that, but I really couldn't figure out how to solve this. So if anyone knows solutions about that, any suggestion will be appreciated, Thx.