A red rectangle randomly appears on my Web page
When objects on a Web page overlap, they define a rectangular area called a graphic region ("A" below).
Whether the area includes text ("B" above) or graphics, Microsoft Publisher generates everything within the graphic region as a graphic when you preview the page or publish it to the Web. This has two negative results:
The resulting graphic takes a longer time to download.
Any alternate text assigned to pictures will not appear.
When you see the rectangular area appear, locate the text or graphics that overlap and position them so that they don't overlap.