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How to insert html content before the </body> tag, via Event and Observer on each page?

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I think you should use layout configuration instead of Event Observer to insert HTML content before the </body> tag.

To achieve that,

  1. Add default.xml to your custom theme or your custom module based on your need.
  • If you want to add it to your custom module, the path should be app/code/YourVendor/YourModule/view/frontend/layout/default.xml
  • If you want to add it to your custom theme, the path should be app/code/YourThemeVendor/YourTheme/Magento_Theme/layout/default.xml

Content:

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceContainer name="before.body.end">
            <block name="custom_content_before_body_end" template="Magento_Theme::html/custom_content_before_body_end.phtml" after="-"/>
        </referenceContainer>
    </body>
</page>
  1. Add custom_content_before_body_end.phtml to your custom theme or your custom module based on your need.
  • If you want to add it to your custom module, the path should be app/code/YourVendor/YourModule/view/frontend/templates/html/custom_content_before_body_end.phtml
  • If you want to add it to your custom theme, the path should be app/code/YourThemeVendor/YourTheme/Magento_Theme/templates/html/custom_content_before_body_end.phtml

Content:

Your custom content goes here
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