--- /dev/null
+<?php
+
+namespace Drupal\filter\Plugin\Filter;
+
+use Drupal\Component\Utility\Html;
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+
+/**
+ * Provides a filter to correct faulty and chopped off HTML.
+ *
+ * @Filter(
+ * id = "filter_htmlcorrector",
+ * title = @Translation("Correct faulty and chopped off HTML"),
+ * type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE,
+ * weight = 10
+ * )
+ */
+class FilterHtmlCorrector extends FilterBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function process($text, $langcode) {
+ return new FilterProcessResult(Html::normalize($text));
+ }
+
+}