I am specifically NOT asking you to change this here---I'll clean it up in a later pull request---but in the future we should try to match Brackets' style guideline of using double quotes to delimit JavaScript strings and single quotes to delimit internal HTML strings. So ideally, here and throughout the file, strings would instead look like `"<span class='ewf-codehint-addition'>"`. But, again, please don't bother fixing this now.