Genesis - Custom SVG Logo in WordPress Customizer

functions.php

<?php

//* Add support for a Custom Logo
add_theme_support( 'custom-logo', array(
	'width'       => 260,
	'height'      => 100,
	'flex-width' => true,
	'flex-height' => true,
) );


//* Add the custom SVG image, inline, into the Site Title element
/*
* @param string $title Current markup of title.
* @param string $inside Markup inside the title.
* @param string $wrap Wrapping element for the title.
*
* @author @_AlphaBlossom
* @author @_neilgee
* @author @_JiveDig
* @author @_srikat
*/
add_filter( 'genesis_seo_title', 'custom_header_inline_logo', 10, 3 );
function custom_header_inline_logo( $title, $inside, $wrap ) {
	// If the custom logo function above exists, and a custom logo file has been selected, set the Logo Image element inside the wrapping tags.
	if ( function_exists( 'has_custom_logo' ) && has_custom_logo() ) {
		$inside = sprintf( '<span class="screen-reader-text">%s</span>%s', esc_html( get_bloginfo( 'name' ) ), get_custom_logo() );
	} else {
		// If no custom logo file selected, wrap around the site name.
		$inside	= sprintf( '<a href="%s">%s</a>', trailingslashit( home_url() ), esc_html( get_bloginfo( 'name' ) ) );
	}

	// Build the title.
	$title = genesis_markup( array(
		'open'    => sprintf( "<{$wrap} %s>", genesis_attr( 'site-title' ) ),
		'close'   => "</{$wrap}>",
		'content' => $inside,
		'context' => 'site-title',
		'echo'    => false,
		'params'  => array(
			'wrap' => $wrap,
		),
	) );

	return $title;
}


//* Output the Custom Logo file
//* OPTIONAL: add custom CSS classes to the element
//* This is helpful when using the 'SVG Support' plugin, where you may need to supply a special class to enable SVG tag output
add_filter( 'get_custom_logo', 'add_custom_logo' );
function add_custom_logo() {
	$custom_logo_id = get_theme_mod( 'custom_logo' );
	$html = sprintf( '<a href="%1$s" class="custom-logo-link" rel="home" itemprop="url">%2$s</a>',
		esc_url( home_url( '/' ) ),
		wp_get_attachment_image( $custom_logo_id, 'full', false, array(
			'class'    => 'custom-logo svg',
			'itemprop' => 'logo',
		) )
	);
	return $html;
}