How to add an attribute to the body tag with a plugin?

It doesn’t appear that you can (easily) add arbitrary attributes to the <body> tag.

However, WordPress provides the function body_class() so you can add classes to the <body> tag.

If your theme uses it, you’ll find something along these lines in a template file (eg. header.php):

<body <?php body_class(); ?>>

In that case, you’ll be able to filter the array of classes being passed using the body_class filter:

add_filter( 'body_class', 'wpse388651_body_class' );
function wpse388651_body_class( $classes ) {
    $classes[] = 'my-custom-class';
    return $classes;
}

Related Posts:

  1. dealing with large HTML output via plugin code
  2. How can I make my custom shortcode work in a Custom HTML Widget?
  3. Output in XHTML or HTML 5 for plugins?
  4. Editor not displaying dynamically after clicking on the button
  5. How to make a custom field as an editor in wordpress?
  6. How to trigger $_GET request within admin plugin page?
  7. How can I get WordPress to save comments in markdown format?
  8. How can i get the post’s full html source by its ID?
  9. Images under 1MB are not being compressed
  10. How to save Setting pages data to the database?
  11. How to translate to spanish wordpress hardcoded content/files?
  12. Can’t access 3rd party API, code works on local server but not on wordpress
  13. Form tries to download a file on submit
  14. hide load more button if there are no posts left to display
  15. How to create a “Most Popular” & “Latest” TAB in WordPress
  16. Where should I save an API key of my user when installing my plugin?
  17. How to make a customize role and view a specific plugins base on that role?
  18. Reusable functions and tools (Framework)
  19. Is Wrapping intval() Around esc_attr() Redundant for Escaping Input?
  20. Programatically download a plugin
  21. Error shown for Trying to get property ‘roles’ of non-object in WordPress After Content for User Roles
  22. WordPress plugin – Error “Plugin generate 2890 characters of unexpected output when activated”
  23. Hook into and send mail using WP Mail SMTP type plugin from HTML static front page?
  24. React JSX in WordPress Plugin Development
  25. My plugin wants to update another plugin
  26. Redirecting to home page after login as custom role WordPress
  27. Add keywords meta to index.php page
  28. Custom form action to handle data inside a plugin
  29. Where (or when) should I register a new taxonomy?
  30. Woocommerce plugin for minimum order and add-to-card-step
  31. Self deactivate plugins after an action occurs
  32. How to get current post user id
  33. UnInstallation of a Plugin from a developers perspective – The correct and clean method
  34. Issue with adding count to “subsubsub” aka quick links on custom_post_type
  35. Pulling data from custom plugin settings using PHP shortcode and Javascript
  36. Inserting HTML tag with ACF into shortcode
  37. How to slice an array using posts_per_page? [closed]
  38. White page on custom plugin option submit
  39. Can I use a plugin for a singular page on my website?
  40. Simple ajax call not working in wordpress plugin
  41. Plugin version is not showing up in wordpress.org plugin directory
  42. Do action only on certain front end pages?
  43. Change plugin main file name (that is currently in the repo)
  44. Create dynamic page content from custom WordPress plugin page
  45. Plugin Options Not Saving to Database in WP 4.5
  46. How to periodically scrape and cache strings from remote txt files. – My First Plugin
  47. How to create ‘import dummy data’ option in custom wordpress plugin
  48. Call to a member function have_posts() on a non-object on normal loop
  49. JS Support Ticket – Auto create WP account
  50. WP Post Template – Templates in own folder
  51. Register Page Template from Plugin
  52. Private Plugin Updates – Localhost
  53. How to change custom post type pemalink Hierarcy
  54. Any hook for pre-plugin-update -either bulk or single plugin update
  55. Get plugin option in another PHP file
  56. wp_create_nonce function doesn’t work inside a plugin?
  57. Test files for plugin development
  58. Input with spaces in Shortcode attributes overwritten by defaults
  59. Unable to override pluggable function wp_mail
  60. Avoid class name collision when using third party libraries in plugins?
  61. How to create custom tables in WordPress using my own plugin?
  62. New User Form – Custom Menu Page
  63. Own plugin corrups plugin-activation
  64. wordpress plugin is not activating from widget
  65. All Users > User List > Update User Meta Field Inline
  66. Checking instances of scripts in wp_head
  67. How to save post change url youtube link?
  68. Best approach to fetch data from wp options to js file or php file
  69. Correct way to perform non-cacheable DB query
  70. Allow users of my plugin to define their own shortcode rather than use mine?
  71. Is it possible to create Custom Post plug-in?
  72. uninstall.php file in Plugin to clean DB
  73. Archive – same title for the first two posts
  74. Creating a plugin to sanitize comment and the url field before display only
  75. Edit Yoast SEO breadcrumbs output [closed]
  76. Creating plugin using simple_html_dom parser?
  77. Object Oriented Plugin not working
  78. Does WP identify plugin by plugin name or plugin_basename?
  79. switched from query_posts to WP_query, not working now?
  80. Making a plugin only available on the front-end for the logged in super admin
  81. Create entire wordpress as a github repositery?
  82. Help With MySQL to WPDB Query Conversion
  83. When to load auto-login code?
  84. AJAX search posts and pages
  85. How to find the origin of a file upload from within wp_handle_upload?
  86. How Do I Figure Out What File(s) to Edit from Looking at the Source Code [closed]
  87. How would I go about creating a user ranked post popularity page?
  88. CSV file generation failing
  89. Updating the Drag-To-Share eXtended share URLs?
  90. finding whether request is for post, and post id
  91. Building plugin with changeable custom post type values…advice needed
  92. How to get all of the activate_plugin action parameters?
  93. __callStatic method handler passed to add_action causes bug in PHP
  94. Enqueue WordPress plugin scripts below all other JS
  95. Display update notification messages like ‘What’s New’
  96. How to add Internationalization in WordPress using Javascript/React?
  97. CRUD and Frontend show from a custom table without shortcode
  98. How to get specific setting by settings_fields()?
  99. Save / Show multi line text in metabox
  100. Creating mySQL procedure with $wpdb
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)