I think you should consider the trade-off. If you toggle visibility with CSS, you still have to put everything in the DOM. Sometimes, putting things in DOM can

I think you should consider the trade-off. If you toggle visibility with CSS, you still have to put everything in the DOM. Sometimes, putting things in DOM can be very expensive. Consider a date picker, a fairly complicated thing with many sub-elements. If you have to put thousands of date pickers in the dom, that's going to take a lot of time. Especially if the user only sees one if they click on an event to edit it.