title_body: Debug javascript epub3 code How can I debug a script write in a epub3 .js file? The script in question read with an xmlhttprequest a file and do some operation with the extracted text. Parsing the file is ok but other operations no. So I'm looking for a debugger but I can't use the FF or IE or Chrome built in debugger because transport all the pages and the script externally of the epub3 file is not my choice. I need to debug and see the wysiwyg of the xhtml code. Actually I use Sigil with the last release published.
  Another solition could be change colors code in my .js file: actually it is located in Misc folder and all the code is black without colors that could help me reading better than now.
  Any help or suggestion world be appreciated.
  Than at all
upvoted_answer: I use HTML Sandbox. It's from W3 Schools. I get some false positives (easily identifiable) but it works for me. I hope this helps.