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1. Drupal Form API, add an image field ... Drupal Form API, add an image field that includes a preview and an alt text field to your custom module's configuration form.

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   <?php

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   // src/Form/SettingsForm.php

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   /* Include theses dependencies in my_custom_module.info.yml

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   dependencies:

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     - drupal:file

2. Check if a page is iframed, add ifra... Check if a page is iframed, add iframe specific enhancements.

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   // This is meant to be included on child frames created with http://blog.apps.npr.org/pym.js/

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   // This script checks if our page is iframed, and if so, induces it to cooperate.

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   // This can allow us to use the same template for all pages on a site, and make being a child iframe an option for any page.

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   document.addEventListener('DOMContentLoaded', function () {

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     var inIFrame = (window.location != window.parent.location) ? true : false;