<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>[60522] trunk/src: Customize: Enable Customizer live previews of Custom CSS in Block Themes.</title>
</head>
<body>
<style type="text/css"><!--
#msg dl.meta { border: 1px #006 solid; background: #369; padding: 6px; color: #fff; }
#msg dl.meta dt { float: left; width: 6em; font-weight: bold; }
#msg dt:after { content:':';}
#msg dl, #msg dt, #msg ul, #msg li, #header, #footer, #logmsg { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt; }
#msg dl a { font-weight: bold}
#msg dl a:link { color:#fc3; }
#msg dl a:active { color:#ff0; }
#msg dl a:visited { color:#cc6; }
h3 { font-family: verdana,arial,helvetica,sans-serif; font-size: 10pt; font-weight: bold; }
#msg pre { white-space: pre-line; overflow: auto; background: #ffc; border: 1px #fa0 solid; padding: 6px; }
#logmsg { background: #ffc; border: 1px #fa0 solid; padding: 1em 1em 0 1em; }
#logmsg p, #logmsg pre, #logmsg blockquote { margin: 0 0 1em 0; }
#logmsg p, #logmsg li, #logmsg dt, #logmsg dd { line-height: 14pt; }
#logmsg h1, #logmsg h2, #logmsg h3, #logmsg h4, #logmsg h5, #logmsg h6 { margin: .5em 0; }
#logmsg h1:first-child, #logmsg h2:first-child, #logmsg h3:first-child, #logmsg h4:first-child, #logmsg h5:first-child, #logmsg h6:first-child { margin-top: 0; }
#logmsg ul, #logmsg ol { padding: 0; list-style-position: inside; margin: 0 0 0 1em; }
#logmsg ul { text-indent: -1em; padding-left: 1em; }#logmsg ol { text-indent: -1.5em; padding-left: 1.5em; }
#logmsg > ul, #logmsg > ol { margin: 0 0 1em 0; }
#logmsg pre { background: #eee; padding: 1em; }
#logmsg blockquote { border: 1px solid #fa0; border-left-width: 10px; padding: 1em 1em 0 1em; background: white;}
#logmsg dl { margin: 0; }
#logmsg dt { font-weight: bold; }
#logmsg dd { margin: 0; padding: 0 0 0.5em 0; }
#logmsg dd:before { content:'\00bb';}
#logmsg table { border-spacing: 0px; border-collapse: collapse; border-top: 4px solid #fa0; border-bottom: 1px solid #fa0; background: #fff; }
#logmsg table th { text-align: left; font-weight: normal; padding: 0.2em 0.5em; border-top: 1px dotted #fa0; }
#logmsg table td { text-align: right; border-top: 1px dotted #fa0; padding: 0.2em 0.5em; }
#logmsg table thead th { text-align: center; border-bottom: 1px solid #fa0; }
#logmsg table th.Corner { text-align: left; }
#logmsg hr { border: none 0; border-top: 2px dashed #fa0; height: 1px; }
#header, #footer { color: #fff; background: #636; border: 1px #300 solid; padding: 6px; }
#patch { width: 100%; }
#patch h4 {font-family: verdana,arial,helvetica,sans-serif;font-size:10pt;padding:8px;background:#369;color:#fff;margin:0;}
#patch .propset h4, #patch .binary h4 {margin:0;}
#patch pre {padding:0;line-height:1.2em;margin:0;}
#patch .diff {width:100%;background:#eee;padding: 0 0 10px 0;overflow:auto;}
#patch .propset .diff, #patch .binary .diff {padding:10px 0;}
#patch span {display:block;padding:0 10px;}
#patch .modfile, #patch .addfile, #patch .delfile, #patch .propset, #patch .binary, #patch .copfile {border:1px solid #ccc;margin:10px 0;}
#patch ins {background:#dfd;text-decoration:none;display:block;padding:0 10px;}
#patch del {background:#fdd;text-decoration:none;display:block;padding:0 10px;}
#patch .lines, .info {color:#888;background:#fff;}
--></style>
<div id="msg">
<dl class="meta" style="font-size: 105%">
<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/60522">60522</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/60522","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2025-07-30 04:22:38 +0000 (Wed, 30 Jul 2025)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Customize: Enable Customizer live previews of Custom CSS in Block Themes.
In a Block Theme, the Custom CSS from the Customizer is inserted into the global styles, before the global style's Custom CSS. In order to update the Customizer's Custom CSS inside of the global styles, milestone CSS comments are added in the preview so that the live preview logic can do the replacement.
Follow-up to <a href="https://core.trac.wordpress.org/changeset/55192">[55192]</a>, <a href="https://core.trac.wordpress.org/changeset/58703">[58703]</a>.
See <a href="https://core.trac.wordpress.org/ticket/57536">#57536</a>, <a href="https://core.trac.wordpress.org/ticket/61395">#61395</a>.
Props westonruter, wildworks, peterwilsoncc, rollybueno, SirLouen, poojapadamad, rafiq91, audrasjb.
Fixes <a href="https://core.trac.wordpress.org/ticket/63589">#63589</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcjs_enqueueswpcustomizepreviewjs">trunk/src/js/_enqueues/wp/customize/preview.js</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizemanagerphp">trunk/src/wp-includes/class-wp-customize-manager.php</a></li>
<li><a href="#trunksrcwpincludesscriptloaderphp">trunk/src/wp-includes/script-loader.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcjs_enqueueswpcustomizepreviewjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/js/_enqueues/wp/customize/preview.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/js/_enqueues/wp/customize/preview.js 2025-07-29 12:56:16 UTC (rev 60521)
+++ trunk/src/js/_enqueues/wp/customize/preview.js 2025-07-30 04:22:38 UTC (rev 60522)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -635,11 +635,28 @@
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Preview changes to custom css.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param {string} value Custom CSS..
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @param {string} value Custom CSS.
</ins><span class="cx" style="display: block; padding: 0 10px"> * @return {void}
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> custom_css: function( value ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $( '#wp-custom-css' ).text( value );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ var style;
+ if ( api.settings.theme.isBlockTheme ) {
+ style = $( 'style#global-styles-inline-css' );
+
+ // Forbid milestone comments from appearing in Custom CSS which would break live preview.
+ value = value.replace( /\/\*(BEGIN|END)_CUSTOMIZER_CUSTOM_CSS\*\//g, '' );
+
+ var textContent = style.text().replace(
+ /(\/\*BEGIN_CUSTOMIZER_CUSTOM_CSS\*\/)((?:.|\s)*?)(\/\*END_CUSTOMIZER_CUSTOM_CSS\*\/)/,
+ function ( match, beforeComment, oldValue, afterComment ) {
+ return beforeComment + '\n' + value + '\n' + afterComment;
+ }
+ );
+ style.text( textContent );
+ } else {
+ style = $( 'style#wp-custom-css' );
+ style.text( value );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> },
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizemanagerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-customize-manager.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-manager.php 2025-07-29 12:56:16 UTC (rev 60521)
+++ trunk/src/wp-includes/class-wp-customize-manager.php 2025-07-30 04:22:38 UTC (rev 60522)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2161,8 +2161,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'keepAliveSend' => 1000,
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> 'theme' => array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'stylesheet' => $this->get_stylesheet(),
- 'active' => $this->is_theme_active(),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ 'stylesheet' => $this->get_stylesheet(),
+ 'active' => $this->is_theme_active(),
+ 'isBlockTheme' => wp_is_block_theme(),
</ins><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="cx" style="display: block; padding: 0 10px"> 'url' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'self' => $self_url,
</span></span></pre></div>
<a id="trunksrcwpincludesscriptloaderphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/script-loader.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/script-loader.php 2025-07-29 12:56:16 UTC (rev 60521)
+++ trunk/src/wp-includes/script-loader.php 2025-07-30 04:22:38 UTC (rev 60522)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2541,8 +2541,27 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * and add it before the global styles custom CSS.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> remove_action( 'wp_head', 'wp_custom_css_cb', 101 );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // Get the custom CSS from the Customizer and add it to the global stylesheet.
- $custom_css = wp_get_custom_css();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ /*
+ * Get the custom CSS from the Customizer and add it to the global stylesheet.
+ * Always do this in Customizer preview for the sake of live preview since it be empty.
+ */
+ $custom_css = trim( wp_get_custom_css() );
+ if ( $custom_css || is_customize_preview() ) {
+ if ( is_customize_preview() ) {
+ /*
+ * When in the Customizer preview, wrap the Custom CSS in milestone comments to allow customize-preview.js
+ * to locate the CSS to replace for live previewing. Make sure that the milestone comments are omitted from
+ * the stored Custom CSS if by chance someone tried to add them, which would be highly unlikely, but it
+ * would break live previewing.
+ */
+ $before_milestone = '/*BEGIN_CUSTOMIZER_CUSTOM_CSS*/';
+ $after_milestone = '/*END_CUSTOMIZER_CUSTOM_CSS*/';
+ $custom_css = str_replace( array( $before_milestone, $after_milestone ), '', $custom_css );
+ $custom_css = $before_milestone . "\n" . $custom_css . "\n" . $after_milestone;
+ }
+ $custom_css = "\n" . $custom_css;
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> $stylesheet .= $custom_css;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Add the global styles custom CSS at the end.
</span></span></pre>
</div>
</div>
</body>
</html>