Do you say content is in a website or on a website? [duplicate]

Solution 1:

Both appear to be grammatically and logically correct. Something can be in the text of a site or appear in the images of a site. Similarly something can appear on the screen of your device showing the website.

However, usage seems to strongly favor on a website.

Solution 2:

Websites seem to be treated in standard English as equivalent to notice-boards, rather than books.

So where you would say "I found that handy fact in the Encyclopaedia Britannica.", it is more normal to say that "I found the answer to that on Wikipedia." This could perhaps follow from the term web-page - after all, content which is (admittedly) in a book can be found on a page.