Compliance with the div-axle screen conditions

[Marcee]

We need a condition in the crypt when the bottom of the block reaches the screen.

I can't understand what a mistake is.

window.onload = function(){
  var point_wrap = document.getElementById('point_wrap');
  var w_height = document.documentElement.clientHeight;
  var point_wrapSourceBottom = point_wrap.getBoundingClientRect().bottom + window.pageYOffset - w_height;
window.onscroll = function() {
if(window.pageYOffset > point_wrapSourceBottom) {
    условие, которое нужно выполнить
}

};

};

If you need a specific HTML code, I'll add it. But for now, I'll just tell you what the block is. #point_wrap It's not on the top of the screen and has a zero height. If substitute w_height the numerical value of the browser window height (621 I have), the code works properly.

And the micro question is confusing. Why the Chrome doesn't show the variable point_wrapSourceBottom In f12, even when the violin works?

[Avante]

The question was decided to be replaced document.documentElement.clientHeight ♪ document.body.clientHeight I don't really know how crossbow it is.