diff --git a/core/lib/Drupal/Core/Field/AllowedTagsXssTrait.php b/core/lib/Drupal/Core/Field/AllowedTagsXssTrait.php
new file mode 100644
index 0000000000..836b8d9729
--- /dev/null
+++ b/core/lib/Drupal/Core/Field/AllowedTagsXssTrait.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\Core\Field;
+
+/**
+ * Useful methods when dealing with displaying allowed tags.
+ *
+ * @deprecated in Drupal 8.0.x, will be removed before Drupal 9.0.0. Use
+ *   \Drupal\Core\Field\FieldFilteredMarkup instead.
+ *
+ * @see \Drupal\Core\Field\FieldFilteredMarkup
+ */
+trait AllowedTagsXssTrait {
+
+  /**
+   * Filters an HTML string to prevent XSS vulnerabilities.
+   *
+   * Like \Drupal\Component\Utility\Xss::filterAdmin(), but with a shorter list
+   * of allowed tags.
+   *
+   * Used for items entered by administrators, like field descriptions, allowed
+   * values, where some (mainly inline) mark-up may be desired (so
+   * \Drupal\Component\Utility\Html::escape() is not acceptable).
+   *
+   * @param string $string
+   *   The string with raw HTML in it.
+   *
+   * @return \Drupal\Core\Field\FieldFilteredMarkup
+   *   An XSS safe version of $string, or an empty string if $string is not
+   *   valid UTF-8.
+   */
+  public function fieldFilterXss($string) {
+    return FieldFilteredMarkup::create($string);
+  }
+
+  /**
+   * Returns a list of tags allowed by AllowedTagsXssTrait::fieldFilterXss().
+   */
+  public function allowedTags() {
+    return FieldFilteredMarkup::allowedTags();
+  }
+
+  /**
+   * Returns a human-readable list of allowed tags for display in help texts.
+   */
+  public function displayAllowedTags() {
+    return FieldFilteredMarkup::displayAllowedTags();
+  }
+
+}