Bage

Modal windows are interesting way to include extran information on a page. <a href="http://www.onextrapixel.com/2014/06/25/create-modal-windows-that-can-be-morphed-from-anything-with-jquery-adaptive-modal-js/" rel="nofollow ugc">adaptive-modal.js</a> makes it beautiful. You can use this little plugin which uses the same jQuery plugin to creae modal windows easily in any page or post or even on a widget uisng shortcode.
I have also added another functionality into this plugin, which will let you to embed your modal content into your post a page directly.
<h3>Usage</h3>
Upon activation, the plugin will create a custom post type called ‘Modals’. Where you can add your content, which later you can use it on a modal or embed directly into your page or post.
<ol>
<li>[modal]</li>
<li>[block] </li>
</ol>
<h3>modal</h3>
the ‘modal’ shortcode is to create modal windows.
For now the [modal] shortcode comes with four attributes.
id 
Your modal id. eg: [modal id=2]Click here[/modal]
data 
If your modal only going to have just text, you can directly add the content in the shortcode. eg: [modal data=”This is my modal content”]Click here[/modal]. This shortcode is much useful when you want to add a modal window to a word in a paragrap without braking the paragrap.
<pre><code>note: you cannot use both id and data in the same shortcode
</code></pre>
background 
This is to style the link and the modal window background. Have to specify a valid color. eg: [modal id=2 background=”#DDDDDD”]Click here[/modal]
color 
This attribute is to change the color of the link. eg: [modal id=2 background=”#DDDDDD” color=”#000000″]Click here[/modal]
<h3>block</h3>
The ‘block’ shortcode is to embed your modal content into any page or post. It only has one attribute.
id 
id of the modal post type post.
<pre><code>note: both block and modal shortcodes uses the same Modals custom post type.
</code></pre>

Flexible Modals

Flexible Modal is a very simple plugin to add modal windows to your WordPress content using shortcodes.

NoreWP

Lou | Digital Marketing

Avi Bashari

PopBox for Elementor allows the creation of beautiful templates with Elementor Page Builder for use with the included Popbox overlay script.
An Admin menu will be added on your WordPress Dashboard sidepane named PopBoxes. This is the custom post type (CPT) you’ll use to create the content of the PopBoxs.
A custom module will also be added to Elementor Page Builder edit screen to be used for the customization of the trigger button embedded on your page. 
Simply select one of the PopBox content created via the CPT to be shown when the trigger button is clicked.
WP Elevation Studio Troy Dean shows us how to use PopBox for Elementor to create easy and stunning popup forms:
<iframe loading="lazy" title="How to Build Pop-Ups using PopBox for Elementor - WP Elevation Studio Learning #elementor" width="750" height="422" src="https://www.youtube.com/embed/IFOGbLsAgo4?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

PopBox For Elementor

Didn't work for me...

Errors out on a GA javascript error even though i have it turned off

When the button is clicked, it shows a backdrop but no modal content.

Its a pity really, this could've really worked

Didn't Work

Adds a popup modal widget for Elementor Page Builder.

Flexible Modals vs PopBox For Elementor