Checks if the bottom of the page is visible.

const bottomVisible = () =>
 document.documentElement.clientHeight + window.scrollY >=
 (document.documentElement.scrollHeight ||
 document.documentElement.clientHeight);

bottomVisible(); // true

Checks if the bottom of the page is visible.
<ul>
<li>Use <code class="notranslate">Window.scrollY</code>, <code class="notranslate">Element.scrollHeight</code> and <code class="notranslate">Element.clientHeight</code> to determine if the bottom of the page is visible.</li>
</ul>

Check if bottom of page is visible

More like this

Element is visible in viewport

Check if browser tab is focused

Redirect to HTTPS