Question

My plugin adds dynamic CSS to the frontpage:

function form_css() {
    header( 'Content-Type: text/css' );
    header( 'Expires: Thu, 31 Dec 2050 23:59:59 GMT' );
    header( 'Pragma: cache' );

    if ( false === ( $css = get_transient( 'mymail_form_css' ) ) ) {
        // generate CSS here
        set_transient( 'mymail_form_css', $css );
    }

    echo $css;
    die();
}

add two action hooks:

add_action('wp_ajax_my_css', 'form_css');
add_action('wp_ajax_nopriv_my_css', 'form_css');

and enqueue the style:

wp_register_style('my-css', admin_url('admin-ajax.php?action=my_css'));
wp_enqueue_style('my-css');

This works perfectly on all browsers (including IE7+8) except on IE9.

I’ve searched for this issue and found about the X-Content-Type-Options: nosniff header but adding header( 'X-Content-Type-Options: nosniff' )doesn’t solve the problem.

Any help is kindly appreciated

Answer 1

I don’t know if this helps somebody. At least for me it does:

WordPress wraps p tags around my shortcodes and since I’m using block elements in my form (and shortcode) I’ve and block element inside a block element – which isn’t allowed.

Removing the surrounded p’s solves the problem.

Edit: Use the Shortcode empty paragraph fix to remove the p’s