Answers for "force user to scroll to bottom of div"

javascript scroll to bottom of div

//scroll to the bottom of "#myDiv"
var myDiv = document.getElementById("myDiv");
    myDiv.scrollTop = myDiv.scrollHeight;

check if scrolled to bottom of div

window.addEventListener("scroll", () => {
    var offset = element.getBoundingClientRect().top - element.offsetParent.getBoundingClientRect().top;
    const top = window.pageYOffset + window.innerHeight - offset;

    if (top === element.scrollHeight) {
        console.log("bottom");
    }
}, { passive: false });