Issue #3135369 by markcarver: Add MarkdownAllowedHtml plugin

<?php

namespace Drupal\bootstrap\Plugin\Markdown\AllowedHtml;

use Drupal\Core\Plugin\PluginBase;

use Drupal\Core\Theme\ActiveTheme;

use Drupal\markdown\Plugin\Markdown\AllowedHtmlInterface;

use Drupal\markdown\Plugin\Markdown\ParserInterface;

/**

 * Provides additional Bootstrap specific allowed HTML for Markdown.

 *

 * @MarkdownAllowedHtml(

 *   id = "bootstrap",

 *   description = @Translation("Provide common global attributes that are useful when dealing with Bootstrap specific output."),

 * )

 */

class Bootstrap extends PluginBase implements AllowedHtmlInterface {

  /**

   * {@inheritdoc}

   */

  public function allowedHtmlTags(ParserInterface $parser, ActiveTheme $activeTheme = NULL) {

    return [

      '*' => [

        'data-complete-text' => TRUE,

        'data-container' => TRUE,

        'data-content' => TRUE,

        'data-dismiss' => TRUE,

        'data-loading-text' => TRUE,

        'data-parent' => TRUE,

        'data-placement' => TRUE,

        'data-ride' => TRUE,

        'data-slide' => TRUE,

        'data-slide-to' => TRUE,

        'data-spy' => TRUE,

        'data-target' => TRUE,

        'data-toggle' => TRUE,

      ],

    ];

  }

}