I can't help with directly showing schematics online, but I have been manually creating web pages from Fritzing Output. Go to whatever view you want, then File ¦ Export ¦ Image As and pick a file type and name. The created file is valid to include as an html img. I have been working with svg exports, because I like the scaling without pixelization. However, I have needed to do manual cleanup for that, since some content is getting dropped or incorrectly rotated and offset. Sample png and jpeg exports have not had any problem.