A manga that can be read online, much like a webcomic, but is fundamentally different from a webcomic due to it's cultural difference, information
flow, and cinematic approach.
An explanation of the differences between a comic and a manga taken from SmartArtBox reads:
1) Cultural Difference
American comics are generally published independently as a monthly issue, mangas are generally published in several anthology titles. A lot happens between the pages but overall, the story moves at a slower pace.
2) Information
Flow
American comics are generally read from left to right and from top to
bottom of the page. However, manga requires the readers to follow
art and the speech bubbles before following a right to left, top to
bottom rule.
Manga generally tries to guide the readers throughout the pages and effectively guides them to where they should look.
3) Cinematic Approach
While manga too can have several action-filled panels, they also have many other types of panels which are generally not found in other types of comics. Aspect-to-aspect panels
will mostly focus on different elements of the same surrounding or different emotions at once.
In manga that the subject-to-subject and aspect-to-aspect panels have
little/no dialog’s at all. This is done to prevent crowding when a lot of things are happening simultaneously.