You need to log the text you borrowed in the same way you log the graphics. Using a web authoring tool to build your code. Using scripts from JavaScript libraries. Copying a Script and then altering it to suit your purpose is fine. Usually, in the source code, you identify the author and how you altered the code.
Web authoring tools are fine to use.
An acceptable quote is made by using the APA style guide . Think about what it makes sense for your site to do, then figure out how to do it. It is easier than just copying scripts without thinking. Using graphics designed by another student. Promotional information on products copied verbatim.