reverted:
--- b/core/modules/inline_form_errors/inline_form_errors.api.php
+++ /dev/null
@@ -1,51 +0,0 @@
-<?php
-
-/**
- * @file
- * API documentation for Inline Form Errors module.
- */
-
-/**
- * @defgroup inline_form_errors Disable Inline Form Errors
- * @{
- *
- * @section Disable Inline Form Errors for an entire form.
- * Set the #disable_inline_form_errors property to TRUE on the top level of the
- * $form array. This should only be done when another appropriate accessibility
- * strategy is in place.
- * @code
- * $form['#disable_inline_form_errors'] = TRUE;
- * @endcode
- *
- * @section Hide inline error messages for certain elements.
- * The #error_no_message property, allows to disable error messages for
- * individual items. Set the #error_no_message to TRUE for the specific element:
- * @code
- * $form['test4'] = [
- *   '#type' => 'textfield',
- *   '#title' => 'Test 4',
- *   '#parents' => ['test4'],
- *   '#array_parents' => ['test4'],
- *   '#id' => 'edit-test4',
- *   '#error_no_message' => TRUE,
- * ];
- * @endcode
- *
- * @section Disable the Inline Form Errors summary.
- * Disable the duplicate messages from summary and inline-error elements. Set
- * the #disable_inline_form_errors_summary property to TRUE on the top level of
- * the $form array.
- * @code
- * $form['#disable_inline_form_errors_summary'] = TRUE
- * @endcode
- *
- * If one or more elements with errors cannot be shown as inline-error (e.g.
- * invisible, missing, or has no title elements), the summary will remain
- * visible with those messages only.
- *
- * See
- * @link https://www.drupal.org/docs/8/core/modules/inline-form-errors @endlink
- * for more information about the Inline Form Errors module.
- *
- * @}
- */
diff -u b/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php b/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
--- b/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
+++ b/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
@@ -218,18 +218,15 @@
    * Tests that disabling Inline Form Errors summary works.
    */
   public function testDisabledInlineErrorsSummary() {
-    $this->messenger->expects($this->exactly(3))
+    $this->messenger->expects($this->exactly(2))
       ->method('addError');
 
     // Assert that messages are summarized for elements that have both no title
     // and are missing or invisible.
     $this->messenger->expects($this->at(0))
       ->method('addError')
-      ->with('no title given');
-    $this->messenger->expects($this->at(1))
-      ->method('addError')
       ->with('element is invisible');
-    $this->messenger->expects($this->at(2))
+    $this->messenger->expects($this->at(1))
       ->method('addError')
       ->with('this missing element is invalid');