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Webfonts: Preload fonts in the head to stop a flash of unstyled content #39391

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Webfonts: Preload fonts in the head to stop a flash of unstyled content #39391

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9a21788
Webfonts: Preload fonts in the head to stop FOUC
scruffian Mar 11, 2022
16ac0d6
prevent security issues by sanitizing input from theme.json
scruffian Mar 11, 2022
529103a
prevent security issues by sanitizing input from theme.json
scruffian Mar 11, 2022
9f5fb53
allow themes to specify which fonts to preload
scruffian Mar 11, 2022
4aab001
Update lib/compat/wordpress-6.0/class-wp-webfonts.php
scruffian Mar 15, 2022
8dcf2b0
Update lib/compat/wordpress-6.0/class-wp-webfonts.php
scruffian Mar 15, 2022
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17 changes: 17 additions & 0 deletions lib/compat/wordpress-6.0/class-wp-webfonts.php
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,9 @@ public function init() {

// Enqueue webfonts in the block editor.
add_action( 'admin_init', array( $this, 'generate_and_enqueue_editor_styles' ) );

// Preload the font files.
add_action( 'wp_head', array( $this, 'preload_webfonts' ) );
}

/**
Expand Down Expand Up @@ -291,4 +294,18 @@ public function generate_styles() {

return $styles;
}

/**
* Preload webfonts to improve performance
*
* @return void
*/
function preload_webfonts() {
foreach ( $this->get_fonts() as $font ) {
foreach( $font['src'] as $src ) {
$srcAsArray = explode( '.', $src );
echo '<link rel="preload" href="' . $src . '" as="font" type="font/' . end( $srcAsArray ) . '" crossorigin />';
}
}
}
}