Add raw HTML to any post/page, without the WordPress editor breaking it.

Noted That:

To install correctly this custom-html-bodyhead.zip.
Fisrt Download the custom-html-bodyhead.zip to your computer
Extract/Open custom-html-bodyhead.zip to Your Computer.
Then, Find readme.txt file inside custom-html-bodyhead.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "custom-html-bodyhead.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "custom-html-bodyhead.zip" Downloaded plugin from your computer, Where you downloaded custom-html-bodyhead.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "WordPress HTML" folder is added on left sidemenu. Now, Click on "WordPress HTML" folder.

Noted that: If you do not see "WordPress HTML" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about WordPress HTML Configurtions and Settings or How to work "WordPress HTML" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "WordPress HTML" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is WordPress HTML
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Upload the plugin to your blog and activate it. In the post/page which needs HTML add a custom field with name: “body”, paste the HTML into the value box, then insert the shortcode [body][/body] where it should appear in the page. You can insert multiple body tags with the syntax: [body id=”element1?][/body], where “element1” is the name of a custom field to insert. To add to the HTML head tag, add a custom field with name: “head” and paste the HTML into the value box. Adding a Custom Field: To add a custom field, scroll down in the editor to Custom Fields. There is an option underneath the dropdown to “Enter New”. Click that, type in “head” or “body”, and then click “Add Custom Field”. This is shown in the screenshots.

Guide

Upload the plugin to your blog and activate it.

In the post/page which needs HTML add a custom field with name: “body”, paste the HTML into the value box, then insert the shortcode [body][/body] where it should appear in the page. You can insert multiple body tags with the syntax: [body id=”element1?][/body], where “element1” is the name of a custom field to insert.

To add to the HTML head tag, add a custom field with name: “head” and paste the HTML into the value box.

Adding a Custom Field:

To add a custom field, scroll down in the editor to Custom Fields. There is an option underneath the dropdown to “Enter New”. Click that, type in “head” or “body”, and then click “Add Custom Field”. This is shown in the screenshots.

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Reffered: https://wordpress.org/