diff --git a/src/wp-includes/html-api/class-wp-html-processor.php b/src/wp-includes/html-api/class-wp-html-processor.php
index cce26a60c5350..c3874fa51a9a1 100644
--- a/src/wp-includes/html-api/class-wp-html-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-processor.php
@@ -941,6 +941,18 @@ private function step_in_body() {
 				$this->reconstruct_active_formatting_elements();
 				$this->insert_html_element( $this->state->current_token );
 				return true;
+
+			/*
+			 * > A start tag whose tag name is "input"
+			 */
+			case '+INPUT':
+				$this->reconstruct_active_formatting_elements();
+				$this->insert_html_element( $this->state->current_token );
+				$type_attribute = $this->get_attribute( 'type' );
+				if ( null === $type_attribute || 'hidden' === strtolower( $type_attribute ) ) {
+					$this->state->frameset_ok = false;
+				}
+				return true;
 		}
 
 		/*
@@ -980,7 +992,6 @@ private function step_in_body() {
 			case 'HR':
 			case 'HTML':
 			case 'IFRAME':
-			case 'INPUT':
 			case 'KEYGEN':
 			case 'LI':
 			case 'LINK':
diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessor.php b/tests/phpunit/tests/html-api/wpHtmlProcessor.php
index d9f1357b5c66f..d2cf982d72959 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessor.php
@@ -176,7 +176,6 @@ public function data_unsupported_special_in_body_tags() {
 			'HR'        => array( 'HR' ),
 			'HTML'      => array( 'HTML' ),
 			'IFRAME'    => array( 'IFRAME' ),
-			'INPUT'     => array( 'INPUT' ),
 			'KEYGEN'    => array( 'KEYGEN' ),
 			'LINK'      => array( 'LINK' ),
 			'LISTING'   => array( 'LISTING' ),
diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php b/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
index 15d38d6f70c6c..d4b6969685fe2 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
@@ -178,7 +178,6 @@ public function data_unsupported_elements() {
 			'HR',
 			'HTML',
 			'IFRAME',
-			'INPUT',
 			'KEYGEN', // Deprecated; void.
 			'LINK',
 			'LISTING', // Deprecated, use PRE instead.