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<?php
//Do not copy the above php tag

//Popular Posts CSS from WIdget
function themeprefix_style_pop_posts() {
    wp_dequeue_style( 'pptwj-widget-tab-css' );
    wp_deregister_style( 'pptwj-widget-tab-css' );
}
add_action( 'wp_enqueue_scripts', 'themeprefix_style_pop_posts', 20);

<?php
//Do not copy the above php tag

// Stop JetPacks Minified/Concatention CSS file
add_filter( 'jetpack_implode_frontend_css', '__return_false' );

//Remove JepPack CSS
function themeprefix_remove_jetpack_css() {
  wp_deregister_style( 'jetpack_related-posts' ); //Related Posts
}
add_action('wp_enqueue_scripts ', 'themeprefix_remove_jetpack_css' );

<?php
//Do not copy the above php tag

// Stop JetPacks Minified/Concatention CSS file
add_filter( 'jetpack_implode_frontend_css', '__return_false' );

//Remove JepPack CSS
function themeprefix_remove_jetpack_css() {
  wp_deregister_style( 'AtD_style' ); // After the Deadline
  wp_deregister_style( 'jetpack_likes' ); // Likes
  wp_deregister_style( 'jetpack_related-posts' ); //Related Posts
  wp_deregister_style( 'jetpack-carousel' ); // Carousel
  wp_deregister_style( 'grunion.css' ); // Grunion contact form
  wp_deregister_style( 'the-neverending-homepage' ); // Infinite Scroll
  wp_deregister_style( 'infinity-twentyten' ); // Infinite Scroll - Twentyten Theme
  wp_deregister_style( 'infinity-twentyeleven' ); // Infinite Scroll - Twentyeleven Theme
  wp_deregister_style( 'infinity-twentytwelve' ); // Infinite Scroll - Twentytwelve Theme
  wp_deregister_style( 'noticons' ); // Notes
  wp_deregister_style( 'post-by-email' ); // Post by Email
  wp_deregister_style( 'publicize' ); // Publicize
  wp_deregister_style( 'sharedaddy' ); // Sharedaddy
  wp_deregister_style( 'sharing' ); // Sharedaddy Sharing
  wp_deregister_style( 'stats_reports_css' ); // Stats
  wp_deregister_style( 'jetpack-widgets' ); // Widgets
  wp_deregister_style( 'jetpack-slideshow' ); // Slideshows
  wp_deregister_style( 'presentations' ); // Presentation shortcode
  wp_deregister_style( 'jetpack-subscriptions' ); // Subscriptions
  wp_deregister_style( 'tiled-gallery' ); // Tiled Galleries
  wp_deregister_style( 'widget-conditions' ); // Widget Visibility
  wp_deregister_style( 'jetpack_display_posts_widget' ); // Display Posts Widget
  wp_deregister_style( 'gravatar-profile-widget' ); // Gravatar Widget
  wp_deregister_style( 'widget-grid-and-list' ); // Top Posts widget
  wp_deregister_style( 'jetpack-widgets' ); // Widgets
}
add_action('wp_enqueue_scripts ', 'themeprefix_remove_jetpack_css' );