WP_Query

    $marquee_loop = new WP_Query(
        array(
            'post_type' => 'marquee_panel',
            'posts_per_page' => 10,
            'post_status' => 'publish'
        )
    );


    while ( $marquee_loop -> have_posts() ) : $marquee_loop -> the_post();
        the_title('<h3>','</h3>');
    endwhile;


//--------------------------------------------------------------------------------------------------------------
    echo '<div class="marquee">';
        echo '<div class="marquee_data">';
            while ( $marquee_loop -> have_posts() ) : $marquee_loop -> the_post();
                $image_id = get_post_thumbnail_id( $post_id );
                $image_url_full = wp_get_attachment_image_src($image_id,'full');
                $image_url_large = wp_get_attachment_image_src($image_id,'large');
                echo '<div class="marquee_panel" data-image-full="'.$image_url_full[0].'" data-image-large="'.$image_url_large[0].'">';
                    echo '<div class="panel_caption">';
                        the_title('<h3>','</h3>');
                        echo '<div class="panel_content">';
                            the_content();
                        echo '</div>';
                    echo '</div>';
                echo '</div>';
            endwhile;
        echo '</div>';
    echo '</div>';


//-----------------------------------------------------------------------------------------------------------------
<!-- Markup of the above code -->
<div class="marquee">
    <div class="marquee_data">

        <div class="marquee_panel"
            data-image-full="http://full-image-url.jpg"
            data-image-large="http://large-image-url.jpg">

            <div class="panel_caption">
                <h3>this is title</h3>
                <div class="panel_content">
                    <p>this is content</p>
                    <a href="#"></a>
                </div>
            </div>
        </div>

    </div>
</div>
<!-- These are HTML5 attributes
data-image-full=""
data-image-large=""
-->