JSFiddle - React, Tailwind, and code Playground

by mrcl

HTML

<h1 id=onsitebefrHiN201812>
Hi
</h1>
<p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p>
<div id="mefobox">
<input>
</div>
<p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p>
<p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p><p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8 uqute98equt eqt8eu
</p>
<p>
ehjhreehgetng iuwneit 8ej jtue tuqetequt8eut8ueq teqt89e8tqu eq8tuqt8...

CSS

#onsitebefrHiN201812 {display:none;position:fixed;}

JavaScript

jQuery(document).ready(function() {
 
function isScrolledIntoView(elem) {
	  if (typeof elem.offset() === "undefined") { return false; }
    var w = jQuery(window),
		d = window.innerHeight,
        docViewTop = w.scrollTop(),
        elemTop = elem.offset().top;
    return (docViewTop >= (elemTop-d));
}
		
		var refelem = jQuery('div#mefobox'); window.angezeigt = false;
		jQuery(window).on("scroll", function() {  
    		if ( isScrolledIntoView(refelem) && window.angezeigt == false ) { 
			 if ((Math.random() <= 1) && (typeof localStorage !== 'undefined') && (localStorage.getItem('onsitebefrHiN201812') == null ) ) {
			 jQuery('#onsitebefrHiN201812').show();
			 window.angezeigt = true;
			}
		} 
}); 
});