Lyden

anyone?

in the post above, it should say: “from a test HTML page” not: “from a test HTML script.” Sorry for confusion

anyone?

Solved it. For some reason, you can’t use the wp_head action. This is very unintuitive. You would think that since you include external scripts via <script> tags in the head, you would use the wp_head action.

I changed:
add_action('wp_head', 'add_header_scripts');

To:
add_action('init', 'add_header_scripts');

Solved it. For some reason, you can’t use the wp_head action. This is very unintuitive. You would think that since you include external scripts via <script> tags in the head, you would use the wp_head action.

I changed:
add_action('wp_head', 'add_header_scripts');

To:
add_action('init', 'add_header_scripts');

Edited