It's best not to put it in your resume. Since you are afraid of being asked, it is better to have more than one thing. Or you can put it another way, write: During your internship, you are involved in or interested in website development (you applied for a job in a website in advance, or you are really interested in developing a website). If this job has nothing to do with the website, you don't need to fill in this experience at all).

Sometimes when we fill in our own experiences, the more complete it is, the more helpful it is to us, but we need to "do what we like". One-sidedness does not mean honesty, but flexibility is also very important. We should know how to foster strengths and avoid weaknesses and constantly improve in practice.

I wish you success!