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I have a WordPress website that is using the Twenty Twenty-Two block theme (more specifically, a child theme of it). I want to edit the <html> root HTML element to add an attribute. I want this line of code:

<html lang="en-US">

... to change into this line of code:

<html lang="en-US" foo="bar">

Since this a block theme, there is no header.php file to edit. How do I do this?

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1 Answer 1

Reset to default
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It's possible to use the language_attributes filter as before since the template canvas in FSE contains:

<html <?php language_attributes(); ?>>

Add this code to the appropriate place in your theme or plugin:

<?php
add_filter( 'language_attributes', function($lang_attributes) {
    return "$lang_attributes foo=\"bar\"";
});
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