wp-includes/media.php:6701Sends the Document-Isolation-Policy header for cross-origin isolation.
function wp_start_cross_origin_isolation_output_buffer(): void { $chromium_version = wp_get_chromium_major_version(); if ( null === $chromium_version || $chromium_version < 137 ) { return; } ob_start( static function ( string $output ): string { header( 'Document-Isolation-Policy: isolate-and-credentialless' ); return wp_add_crossorigin_attributes( $output ); } );}Introduced in 7.1.0.
Signature, return type and hooks compared across 1 parsed release.
src/wp-includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.