In Chapter 4 of Jump Start Node.js, after adding these 2 gists to chapter4/views/index.ejs:

you end up with 2 id's named "imagePlaceHolder" in a single html page, one for each of the modals. To be a valid html page, id's must be unique within a page. So our chapter4/views/index.ejs produces an invalid html page.

Was this intentional, or is this a mistake?