It’s a difficult one, I am very dyslexic but I don’t see text jumping or moving on the page. I do struggle with huge amounts of text information on a page and when I follow a tutorial online for example a voice talking or discussion the item is really engaging for me.
As for graphics again it depends on how well they have been constructed, do they include text, what colours are used etc. I actually engage with moving images much more successfully that with text and a voice over which probably explains why I teach animation.
But I think what is important is to remember not all people with dyslexia have the same issues when faced with text based information. I would argue an online learner requires the same amount of student centred approaches as a student sitting in the real world.