Thank you for your inquiry.
Unfortunately picture bullets are not supported in conversion to HTML. All standard bullets are currently output as type =“disc”. I’m sorry for misinformation in that file. Most probably this “plus” was added by overlook when we supported picture bullets in PDF export.
Please let us know what kind of bullets is necessary for you. At least we should start distinguishing three predefined HTML glyphs: disc, circle and square. Next we plan to support picture bullets.
We have several known issues in our defect database related to bullets:
#4209 – Support picture bullets in HTML.
#3043 – Consider using list-style, list-style-type, list-style-image, list-style-position CSS attributes.