[wp-trac] [WordPress Trac] #48887: Consistent use of wp_body_open() and body opening actions

[WordPress Trac]

#48887: Consistent use of wp_body_open() and body opening actions
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 Reporter:  ramiy                     |      Owner:  (none)
     Type:  enhancement               |     Status:  new
 Priority:  normal                    |  Milestone:  Awaiting Review
Component:  Administration            |    Version:
 Severity:  normal                    |   Keywords:  has-patch
  Focuses:  administration, template  |
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 == Background ==

 In changeset [changeset:"45042" 45042] WordPress 5.2 finally introduced
 the long waited
 [https://developer.wordpress.org/reference/functions/wp_body_open/
 wp_body_open()] function which fires the
 [https://developer.wordpress.org/reference/hooks/wp_body_open/
 wp_body_open] action hook immediately after the opening `body` tag.

 This little action helps developers to insert JavaScript right after the
 opening body tag required by 3rd party services like Google Tag Manager.

 Dev note: https://make.wordpress.org/core/2019/04/24/miscellaneous-
 developer-updates-in-5-2/

 We did a very good job but the hooks are not consistent on other pages
 (dashboard, login pages and embed templates). This will allow developers
 to insert code not only to the theme.

 === Theme Structure ===

 The new theme structure uses several basic functions which fires action
 hooks:

 * `wp_head` action fired by `wp_head()`
 * `wp_footer` action fired by `wp_footer()`
 * `wp_body_open` action fired by `wp_body_open()`

 But the front end is not the only place where developers need to insert
 JavaScript.

 === WP Admin ===

 The WordPress dashboard uses the following action hooks:

 * `admin_head` action
 * `admin_footer` action

 Missing `admin_body_open` action.


 === Login Page ===

 The login page uses the following action hooks:

 * `login_head` action
 * `login_footer` action

 Missing `login_body_open` action.


 === Embed Templates ===

 The embed templates uses the following action hooks:

 * `embed_head` action
 * `embed_footer` action

 Missing `embed_body_open` action.

 === Other ===

 The attached patch added the missing `{$page}_body_open` hooks.

 If you know about other pages that missed, please comment bellow and I'll
 update the patch.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48887>
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