Add HTML5 Shiv and Respond .js to end of wp_head()

HTML5-Shiv-and-Respond-JS.md

Wordpress - Add HTML5 shiv, Respond.js for IE8

<?php 
/**
 * Add HTML5 shiv, Respond.js for IE8
 */
add_action( 'wp_head', 'ie_support_header', 99 );
function ie_support_header() {
	echo '<!--[if lt IE 9]>' . "\n";
	echo '<script src="' . esc_url( get_template_directory_uri() . '/inc/js/html5shiv.min.js' ) . '"></script>' . "\n";
	echo '<script src="' . esc_url( get_template_directory_uri() . '/inc/js/respond.min.js' ) . '"></script>' . "\n";
	echo '<![endif]-->' . "\n";
}