Generally, computer systems in schools/collages/universities prohibit installing softwares by normal users. This may limit the students/teachers to freely installing/customizing softwares especially editors. Sweetie is a Web-based Editor for teaching/learning Web content development. Sweetie works as a web application running on the local web server. Thus the students can fully customize the features of the editor, and enable the editor functions such as syntax highlighting and indent. Thanks to the local web server platform, collaborative editing can be introduced.