Function and usage of enqueue_embed_scripts() in wordpress


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    The enqueue_embed_scripts() function in WordPress is specifically designed for handling the enqueueing of default CSS and JavaScript for embed iframes. Here's a detailed explanation and a sample usage:

    Function: enqueue_embed_scripts()


    • Enqueues Embed Iframe Default CSS and JS: This function is primarily used to enqueue the default CSS and JavaScript necessary for the proper styling and functionality of embed iframes in WordPress.


    • Enqueue PNG Fallback CSS for Legacy Versions of IE: The function includes a fallback mechanism, typically in the form of CSS, to ensure that embeds are displayed correctly in older versions of Internet Explorer. This is particularly important for compatibility with these legacy browsers where modern CSS standards may not be fully supported.
    • Allows Plugins to Queue Scripts for Embed Iframe End: It provides a way for plugins to add their own scripts to the embed iframe. This is done using the wp_enqueue_script() function, which is a standard WordPress function for enqueueing scripts.
    • Runs First in oembed_head(): The enqueue_embed_scripts() function is executed at the beginning of the oembed_head() function. This ensures that the necessary styles and scripts are loaded early in the page head for embeds.

    Sample Usage:

    function my_custom_embed_scripts() {
        // Enqueue a custom stylesheet for embeds
        wp_enqueue_style( 'my-custom-embed-style', get_stylesheet_directory_uri() . '/css/custom-embed-style.css' );
        // Enqueue a custom script for embeds
        wp_enqueue_script( 'my-custom-embed-script', get_stylesheet_directory_uri() . '/js/custom-embed-script.js', array(), '1.0.0', true );
    // Hook into 'enqueue_embed_scripts' action to add custom embed styles and scripts
    add_action( 'enqueue_embed_scripts', 'my_custom_embed_scripts' );

    In this sample usage:

    • A custom CSS file (custom-embed-style.css) and a JavaScript file (custom-embed-script.js) are enqueued for the embed iframes.
    • The wp_enqueue_style and wp_enqueue_script functions are used to enqueue the custom stylesheet and script, respectively.
    • The add_action function hooks the my_custom_embed_scripts function to the enqueue_embed_scripts action, ensuring that the custom styles and scripts are loaded for embed iframes.

    This function is part of the internal mechanism WordPress uses to manage embeds, and it provides a standardized way to include additional styles and scripts specifically for embed iframes, enhancing both compatibility and functionality.

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