I'm learning how to use short codes but I don't undrestand why WordPress keeps rendering broken paragraph tags.

I created a file called wp-content/themes/twentytwentythree/templates/single.html with the following content:

<main class="wp-block-group" style="margin-top:var(--wp--preset--spacing--50)">
<!-- wp:shortcode -->
<!-- /wp:shortcode -->

I then made a file called wp-content/plugins/wl/wl.php with the following contents:

 * Plugin Name: Hello
 * Description: World

function wl_event_head($att) {
  return '<section>
    <h1>Hello WP</h1>

add_shortcode('wl_event_head', 'wl_event_head');

When I look View Source of FireFox, I see this:

<main class="wp-block-group" style="margin-top:var(--wp--preset--spacing--50)">
<h1>Hello WP</h1>


Why is there a closing p tag? I noticed that if I delete some spaces in my return string for function wl_event_head($att), then sometimes maybe the closing p tag goes away.

What am I doing wrong?

Note: I tried putting this code in my wp-content/themes/twentytwentythree/functions.php

remove_filter( 'the_content', 'wpautop' );
remove_filter( 'the_excerpt', 'wpautop' );

It did not fix the problem.

1 Answer 1


I worked around my problem by minifying my html in my plugin. So I made a function called wl_minify_html(String $htmlString) (which I found some another stack overflow answer somewhere). So here's what my plugin looks like now:


function wl_minify_html($htmlString) {

    $search = array(
        '/\>(\s)+\</s',     // strip white space between tags
        '/\>[^\S ]+/s',     // strip whitespaces after tags, except space
        '/[^\S ]+\</s',     // strip whitespaces before tags, except space
        '/(\s)+/s',         // shorten multiple whitespace sequences
        '/<!--(.|\s)*?-->/' // Remove HTML comments

    $replace = array(

    $buffer = preg_replace($search, $replace, $htmlString);

    return $buffer;

function wl_event_head($att) {
  return wl_minify_html('<section>
    <h1>Hello WP</h1>

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