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<title>[61145] trunk/src/wp-includes/block-supports/typography.php: Block editor: Make fit text work with the interactivity API.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/61145">61145</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/61145","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>jorgefilipecosta</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2025-11-06 18:22:27 +0000 (Thu, 06 Nov 2025)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Block editor: Make fit text work with the interactivity API.
Fit text did not work after navigating to a page using the Interactivity API router. When users navigated to a post via client-side navigation (e.g., in a Query block with pagination), fit text blocks would not recalculate their font sizes, appearing either too large or too small.
This occurred because the fit text initialization only ran on the window.load event, which doesn't fire during client-side navigation.
We refactored fit text front end to be an interactivity api first implementation, using an interactivity api init event instead of a window load event.
This commit adds the required PHP changes.
Props jorgefilipecosta, mukesh27, luisherranz.
Fixes <a href="https://core.trac.wordpress.org/ticket/64210">#64210</a>.</pre>
<h3>Modified Paths</h3>
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<li><a href="#trunksrcwpincludesblocksupportstypographyphp">trunk/src/wp-includes/block-supports/typography.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpincludesblocksupportstypographyphp"></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/block-supports/typography.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/block-supports/typography.php 2025-11-05 20:32:08 UTC (rev 61144)
+++ trunk/src/wp-includes/block-supports/typography.php 2025-11-06 18:22:27 UTC (rev 61145)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -308,6 +308,20 @@
</span><span class="cx" style="display: block; padding: 0 10px"> function wp_render_typography_support( $block_content, $block ) {
</span><span class="cx" style="display: block; padding: 0 10px"> if ( ! empty( $block['attrs']['fitText'] ) && ! is_admin() ) {
</span><span class="cx" style="display: block; padding: 0 10px"> wp_enqueue_script_module( '@wordpress/block-editor/utils/fit-text-frontend' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ // Add Interactivity API directives for fit text to work with client-side navigation.
+ if ( ! empty( $block_content ) ) {
+ $processor = new WP_HTML_Tag_Processor( $block_content );
+ if ( $processor->next_tag() ) {
+ if ( ! $processor->get_attribute( 'data-wp-interactive' ) ) {
+ $processor->set_attribute( 'data-wp-interactive', true );
+ }
+ $processor->set_attribute( 'data-wp-context---core-fit-text', 'core/fit-text::{"fontSize":""}' );
+ $processor->set_attribute( 'data-wp-init---core-fit-text', 'core/fit-text::callbacks.init' );
+ $processor->set_attribute( 'data-wp-style--font-size', 'core/fit-text::context.fontSize' );
+ $block_content = $processor->get_updated_html();
+ }
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> return $block_content;
</span></span></pre>
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