html5shiv-8.x-1.1/html5shiv.module

<?php

/**
 * @file
 * Contains html5shiv.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function html5shiv_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.html5shiv':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The core asset library core/html5shiv is deprecated in Drupal 8.8 and removed in Drupal 9. This module provides the same asset library for any sites which need to continue to support older browsers.') . '</p>';
      $output .= '<p>' . t('For more information about the deprecation of html5shiv, see this <a href=":change-record">change record</a>', [':change-record' => 'https://www.drupal.org/node/3086383']) . '</p>';
      $output .= '<p>' . t('Visit the <a href=":project_link">html5shiv project page</a> on Drupal.org for more information about this module.', [':project_link' => 'https://www.drupal.org/project/html5shiv']) . '</p>';

      return $output;
  }
}

/**
 * Implements hook_page_attachments_alter().
 */
function html5shiv_page_attachments_alter(array &$attachments) {
  if (isset($attachments['#attached']['library'])) {
    // Remove html5shiv if it was attached to the page.
    $index = array_search('core/html5shiv', $attachments['#attached']['library']);
    if ($index !== FALSE) {
      unset($attachments['#attached']['library'][$index]);
    }
  }
}

/**
 * Implements hook_element_info_alter().
 */
function html5shiv_element_info_alter(array &$info) {
  if (isset($info['html']['#attached']['library'])) {
    $index = array_search('core/html5shiv', $info['html']['#attached']['library']);
    if ($index !== FALSE) {
      unset($info['html']['#attached']['library'][$index]);
    }
  }

  $info['html']['#attached']['library'][] = 'html5shiv/html5shiv';
}