diff --git a/lib/experimental/html/class-wp-html-tag-processor.php b/lib/experimental/html/class-wp-html-tag-processor.php
index 2cb2b565a654a0..02afdf9ecc005a 100644
--- a/lib/experimental/html/class-wp-html-tag-processor.php
+++ b/lib/experimental/html/class-wp-html-tag-processor.php
@@ -1221,13 +1221,24 @@ public function remove_class( $class_name ) {
 
 	/**
 	 * Returns the string representation of the HTML Tag Processor.
-	 * It closes the HTML Tag Processor and prevents further lookups and modifications.
 	 *
 	 * @since 6.2.0
+	 * @see get_updated_html
 	 *
 	 * @return string The processed HTML.
 	 */
 	public function __toString() {
+		return $this->get_updated_html();
+	}
+
+	/**
+	 * Returns the string representation of the HTML Tag Processor.
+	 *
+	 * @since 6.2.0
+	 *
+	 * @return string The processed HTML.
+	 */
+	public function get_updated_html() {
 		// Short-circuit if there are no updates to apply.
 		if ( ! count( $this->classname_updates ) && ! count( $this->attribute_updates ) ) {
 			return $this->updated_html . substr( $this->html, $this->updated_bytes );
diff --git a/phpunit/html/wp-html-tag-processor-standalone-test.php b/phpunit/html/wp-html-tag-processor-standalone-test.php
index cef9b45f7c5d5e..d5635360e3c907 100644
--- a/phpunit/html/wp-html-tag-processor-standalone-test.php
+++ b/phpunit/html/wp-html-tag-processor-standalone-test.php
@@ -175,7 +175,27 @@ public function test_attributes_parser_treats_slash_as_attribute_separator() {
 	 *
 	 * @covers __toString
 	 */
-	public function test_tostring_applies_the_updates_so_far_and_keeps_the_processor_on_the_current_tag() {
+	public function tostring_returns_updated_html() {
+		$p = new WP_HTML_Tag_Processor( '<hr id="remove" /><div enabled class="test">Test</div><span id="span-id"></span>' );
+		$p->next_tag();
+		$p->remove_attribute( 'id' );
+
+		$p->next_tag();
+		$p->set_attribute( 'id', 'div-id-1' );
+		$p->add_class( 'new_class_1' );
+
+		$this->assertEquals(
+			$p->get_updated_html(),
+			(string) $p
+		);
+	}
+
+	/**
+	 * @ticket 56299
+	 *
+	 * @covers get_updated_html
+	 */
+	public function test_get_updated_html_applies_the_updates_so_far_and_keeps_the_processor_on_the_current_tag() {
 		$p = new WP_HTML_Tag_Processor( '<hr id="remove" /><div enabled class="test">Test</div><span id="span-id"></span>' );
 		$p->next_tag();
 		$p->remove_attribute( 'id' );
@@ -185,24 +205,24 @@ public function test_tostring_applies_the_updates_so_far_and_keeps_the_processor
 		$p->add_class( 'new_class_1' );
 		$this->assertSame(
 			'<hr  /><div id="div-id-1" enabled class="test new_class_1">Test</div><span id="span-id"></span>',
-			(string) $p,
-			'Calling __toString after updating the attributes of the second tag returned different HTML than expected'
+			$p->get_updated_html(),
+			'Calling get_updated_html after updating the attributes of the second tag returned different HTML than expected'
 		);
 
 		$p->set_attribute( 'id', 'div-id-2' );
 		$p->add_class( 'new_class_2' );
 		$this->assertSame(
 			'<hr  /><div id="div-id-2" enabled class="test new_class_1 new_class_2">Test</div><span id="span-id"></span>',
-			(string) $p,
-			'Calling __toString after updating the attributes of the second tag for the second time returned different HTML than expected'
+			$p->get_updated_html(),
+			'Calling get_updated_html after updating the attributes of the second tag for the second time returned different HTML than expected'
 		);
 
 		$p->next_tag();
 		$p->remove_attribute( 'id' );
 		$this->assertSame(
 			'<hr  /><div id="div-id-2" enabled class="test new_class_1 new_class_2">Test</div><span ></span>',
-			(string) $p,
-			'Calling __toString after removing the id attribute of the third tag returned different HTML than expected'
+			$p->get_updated_html(),
+			'Calling get_updated_html after removing the id attribute of the third tag returned different HTML than expected'
 		);
 
 	}
@@ -210,11 +230,11 @@ public function test_tostring_applies_the_updates_so_far_and_keeps_the_processor
 	/**
 	 * @ticket 56299
 	 *
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
-	public function test_tostring_without_updating_any_attributes_returns_the_original_html() {
+	public function test_get_updated_html_without_updating_any_attributes_returns_the_original_html() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
-		$this->assertSame( self::HTML_SIMPLE, (string) $p );
+		$this->assertSame( self::HTML_SIMPLE, $p->get_updated_html() );
 	}
 
 	/**
@@ -241,7 +261,7 @@ public function test_next_tag_should_return_false_for_a_non_existing_tag() {
 	 * @ticket 56299
 	 *
 	 * @covers next_tag
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_set_attribute_on_a_non_existing_tag_does_not_change_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
@@ -250,8 +270,8 @@ public function test_set_attribute_on_a_non_existing_tag_does_not_change_the_mar
 		$p->set_attribute( 'id', 'primary' );
 		$this->assertSame(
 			self::HTML_SIMPLE,
-			(string) $p,
-			'Calling __toString after updating a non-existing tag returned an HTML that was different from the original HTML'
+			$p->get_updated_html(),
+			'Calling get_updated_html after updating a non-existing tag returned an HTML that was different from the original HTML'
 		);
 	}
 
@@ -294,7 +314,7 @@ public function test_set_attribute_prevents_xss( $attribute_value ) {
 		 * over the content and because we want to look at the raw values.
 		 */
 		$match = null;
-		preg_match( '~^<div test=(.*)></div>$~', (string) $p, $match );
+		preg_match( '~^<div test=(.*)></div>$~', $p->get_updated_html(), $match );
 		list( , $actual_value ) = $match;
 
 		$this->assertEquals( $actual_value, '"' . esc_attr( $attribute_value ) . '"' );
@@ -321,13 +341,13 @@ public function data_set_attribute_escapable_values() {
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_set_attribute_with_a_non_existing_attribute_adds_a_new_attribute_to_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->set_attribute( 'test-attribute', 'test-value' );
-		$this->assertSame( '<div test-attribute="test-value" id="first"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div test-attribute="test-value" id="first"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
@@ -337,33 +357,33 @@ public function test_set_attribute_with_a_non_existing_attribute_adds_a_new_attr
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_update_first_when_duplicated_attribute() {
 		$p = new WP_HTML_Tag_Processor( '<div id="update-me" id="ignored-id"><span id="second">Text</span></div>' );
 		$p->next_tag();
 		$p->set_attribute( 'id', 'updated-id' );
-		$this->assertSame( '<div id="updated-id" id="ignored-id"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div id="updated-id" id="ignored-id"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_set_attribute_with_an_existing_attribute_name_updates_its_value_in_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->set_attribute( 'id', 'new-id' );
-		$this->assertSame( '<div id="new-id"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div id="new-id"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_next_tag_and_set_attribute_in_a_loop_update_all_tags_in_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
@@ -371,7 +391,7 @@ public function test_next_tag_and_set_attribute_in_a_loop_update_all_tags_in_the
 			$p->set_attribute( 'data-foo', 'bar' );
 		}
 
-		$this->assertSame( '<div data-foo="bar" id="first"><span data-foo="bar" id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div data-foo="bar" id="first"><span data-foo="bar" id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
@@ -387,86 +407,86 @@ public function test_next_tag_and_set_attribute_in_a_loop_update_all_tags_in_the
 	 * @ticket 56299
 	 *
 	 * @covers remove_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_first_when_duplicated_attribute() {
 		$p = new WP_HTML_Tag_Processor( '<div id="update-me" id="ignored-id"><span id="second">Text</span></div>' );
 		$p->next_tag();
 		$p->remove_attribute( 'id' );
-		$this->assertSame( '<div  id="ignored-id"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div  id="ignored-id"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers remove_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_attribute_with_an_existing_attribute_name_removes_it_from_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->remove_attribute( 'id' );
-		$this->assertSame( '<div ><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div ><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers remove_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_attribute_with_a_non_existing_attribute_name_does_not_change_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->remove_attribute( 'no-such-attribute' );
-		$this->assertSame( self::HTML_SIMPLE, (string) $p );
+		$this->assertSame( self::HTML_SIMPLE, $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_add_class_creates_a_class_attribute_when_there_is_none() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->add_class( 'foo-class' );
-		$this->assertSame( '<div class="foo-class" id="first"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div class="foo-class" id="first"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_calling_add_class_twice_creates_a_class_attribute_with_both_class_names_when_there_is_no_class_attribute() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->add_class( 'foo-class' );
 		$p->add_class( 'bar-class' );
-		$this->assertSame( '<div class="foo-class bar-class" id="first"><span id="second">Text</span></div>', (string) $p );
+		$this->assertSame( '<div class="foo-class bar-class" id="first"><span id="second">Text</span></div>', $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_class_does_not_change_the_markup_when_there_is_no_class_attribute() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_SIMPLE );
 		$p->next_tag();
 		$p->remove_class( 'foo-class' );
-		$this->assertSame( self::HTML_SIMPLE, (string) $p );
+		$this->assertSame( self::HTML_SIMPLE, $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_add_class_appends_class_names_to_the_existing_class_attribute_when_one_already_exists() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -475,7 +495,7 @@ public function test_add_class_appends_class_names_to_the_existing_class_attribu
 		$p->add_class( 'bar-class' );
 		$this->assertSame(
 			'<div class="main with-border foo-class bar-class" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -483,7 +503,7 @@ public function test_add_class_appends_class_names_to_the_existing_class_attribu
 	 * @ticket 56299
 	 *
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_class_removes_a_single_class_from_the_class_attribute_when_one_exists() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -491,7 +511,7 @@ public function test_remove_class_removes_a_single_class_from_the_class_attribut
 		$p->remove_class( 'main' );
 		$this->assertSame(
 			'<div class=" with-border" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -499,7 +519,7 @@ public function test_remove_class_removes_a_single_class_from_the_class_attribut
 	 * @ticket 56299
 	 *
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_calling_remove_class_with_all_listed_class_names_removes_the_existing_class_attribute_from_the_markup() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -508,7 +528,7 @@ public function test_calling_remove_class_with_all_listed_class_names_removes_th
 		$p->remove_class( 'with-border' );
 		$this->assertSame(
 			'<div  id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -516,7 +536,7 @@ public function test_calling_remove_class_with_all_listed_class_names_removes_th
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_add_class_does_not_add_duplicate_class_names() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -524,7 +544,7 @@ public function test_add_class_does_not_add_duplicate_class_names() {
 		$p->add_class( 'with-border' );
 		$this->assertSame(
 			'<div class="main with-border" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -532,7 +552,7 @@ public function test_add_class_does_not_add_duplicate_class_names() {
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_add_class_preserves_class_name_order_when_a_duplicate_class_name_is_added() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -540,7 +560,7 @@ public function test_add_class_preserves_class_name_order_when_a_duplicate_class
 		$p->add_class( 'main' );
 		$this->assertSame(
 			'<div class="main with-border" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -548,7 +568,7 @@ public function test_add_class_preserves_class_name_order_when_a_duplicate_class
 	 * @ticket 56299
 	 *
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_add_class_when_there_is_a_class_attribute_with_excessive_whitespaces() {
 		$p = new WP_HTML_Tag_Processor(
@@ -558,7 +578,7 @@ public function test_add_class_when_there_is_a_class_attribute_with_excessive_wh
 		$p->add_class( 'foo-class' );
 		$this->assertSame(
 			'<div class="   main   with-border foo-class" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -566,7 +586,7 @@ public function test_add_class_when_there_is_a_class_attribute_with_excessive_wh
 	 * @ticket 56299
 	 *
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_remove_class_preserves_whitespaces_when_there_is_a_class_attribute_with_excessive_whitespaces() {
 		$p = new WP_HTML_Tag_Processor(
@@ -576,7 +596,7 @@ public function test_remove_class_preserves_whitespaces_when_there_is_a_class_at
 		$p->remove_class( 'with-border' );
 		$this->assertSame(
 			'<div class="   main" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -584,7 +604,7 @@ public function test_remove_class_preserves_whitespaces_when_there_is_a_class_at
 	 * @ticket 56299
 	 *
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_removing_all_classes_removes_the_existing_class_attribute_from_the_markup_even_when_excessive_whitespaces_are_present() {
 		$p = new WP_HTML_Tag_Processor(
@@ -595,7 +615,7 @@ public function test_removing_all_classes_removes_the_existing_class_attribute_f
 		$p->remove_class( 'with-border' );
 		$this->assertSame(
 			'<div  id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -609,7 +629,7 @@ public function test_removing_all_classes_removes_the_existing_class_attribute_f
 	 *
 	 * @covers add_class
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_set_attribute_takes_priority_over_add_class() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -618,8 +638,8 @@ public function test_set_attribute_takes_priority_over_add_class() {
 		$p->set_attribute( 'class', 'set_attribute' );
 		$this->assertSame(
 			'<div class="set_attribute" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p,
-			'Calling __toString after updating first tag\'s attributes did not return the expected HTML'
+			$p->get_updated_html(),
+			'Calling get_updated_html after updating first tag\'s attributes did not return the expected HTML'
 		);
 
 		$p = new WP_HTML_Tag_Processor( self::HTML_WITH_CLASSES );
@@ -628,8 +648,8 @@ public function test_set_attribute_takes_priority_over_add_class() {
 		$p->add_class( 'add_class' );
 		$this->assertSame(
 			'<div class="set_attribute" id="first"><span class="not-main bold with-border" id="second">Text</span></div>',
-			(string) $p,
-			'Calling __toString after updating second tag\'s attributes did not return the expected HTML'
+			$p->get_updated_html(),
+			'Calling get_updated_html after updating second tag\'s attributes did not return the expected HTML'
 		);
 	}
 
@@ -640,7 +660,7 @@ public function test_set_attribute_takes_priority_over_add_class() {
 	 * @covers remove_attribute
 	 * @covers add_class
 	 * @covers remove_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_advanced_use_case() {
 		$input = <<<HTML
@@ -730,7 +750,7 @@ public function test_advanced_use_case() {
 		$p->remove_attribute( 'class' );
 		$this->assertFalse( $p->next_tag( 'non-existent' ), 'Querying a non-existing tag did not return false' );
 		$p->set_attribute( 'class', 'test' );
-		$this->assertSame( $expected_output, (string) $p, 'Calling __toString after updating the attributes did not return the expected HTML' );
+		$this->assertSame( $expected_output, $p->get_updated_html(), 'Calling get_updated_html after updating the attributes did not return the expected HTML' );
 	}
 
 	/**
@@ -738,7 +758,7 @@ public function test_advanced_use_case() {
 	 *
 	 * @covers remove_attribute
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_correctly_parses_html_attributes_wrapped_in_single_quotation_marks() {
 		$p = new WP_HTML_Tag_Processor(
@@ -760,7 +780,7 @@ public function test_correctly_parses_html_attributes_wrapped_in_single_quotatio
 		$p->set_attribute( 'id', 'single-quote' );
 		$this->assertSame(
 			'<div ><span id="single-quote">Text</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -768,7 +788,7 @@ public function test_correctly_parses_html_attributes_wrapped_in_single_quotatio
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_set_attribute_with_value_equals_to_true_adds_a_boolean_html_attribute_with_implicit_value() {
 		$p = new WP_HTML_Tag_Processor(
@@ -778,7 +798,7 @@ public function test_set_attribute_with_value_equals_to_true_adds_a_boolean_html
 		$p->set_attribute( 'checked', true );
 		$this->assertSame(
 			'<form action="/action_page.php"><input checked type="checkbox" name="vehicle" value="Bike"><label for="vehicle">I have a bike</label></form>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -786,7 +806,7 @@ public function test_set_attribute_with_value_equals_to_true_adds_a_boolean_html
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_setting_a_boolean_attribute_to_false_removes_it_from_the_markup() {
 		$p = new WP_HTML_Tag_Processor(
@@ -796,7 +816,7 @@ public function test_setting_a_boolean_attribute_to_false_removes_it_from_the_ma
 		$p->set_attribute( 'checked', false );
 		$this->assertSame(
 			'<form action="/action_page.php"><input  type="checkbox" name="vehicle" value="Bike"><label for="vehicle">I have a bike</label></form>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -804,21 +824,21 @@ public function test_setting_a_boolean_attribute_to_false_removes_it_from_the_ma
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_setting_a_missing_attribute_to_false_does_not_change_the_markup() {
 		$html_input = '<form action="/action_page.php"><input type="checkbox" name="vehicle" value="Bike"><label for="vehicle">I have a bike</label></form>';
 		$p          = new WP_HTML_Tag_Processor( $html_input );
 		$p->next_tag( 'input' );
 		$p->set_attribute( 'checked', false );
-		$this->assertSame( $html_input, (string) $p );
+		$this->assertSame( $html_input, $p->get_updated_html() );
 	}
 
 	/**
 	 * @ticket 56299
 	 *
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_setting_a_boolean_attribute_to_a_string_value_adds_explicit_value_to_the_markup() {
 		$p = new WP_HTML_Tag_Processor(
@@ -828,7 +848,7 @@ public function test_setting_a_boolean_attribute_to_a_string_value_adds_explicit
 		$p->set_attribute( 'checked', 'checked' );
 		$this->assertSame(
 			'<form action="/action_page.php"><input checked="checked" type="checkbox" name="vehicle" value="Bike"><label for="vehicle">I have a bike</label></form>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -986,7 +1006,7 @@ public function data_rcdata_state() {
 	 *
 	 * @covers next_tag
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_can_query_and_update_wrongly_nested_tags() {
 		$p = new WP_HTML_Tag_Processor(
@@ -998,7 +1018,7 @@ public function test_can_query_and_update_wrongly_nested_tags() {
 		$p->set_attribute( 'class', 'p-class' );
 		$this->assertSame(
 			'<span class="span-class">123<p class="p-class">456</span>789</p>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -1007,7 +1027,7 @@ public function test_can_query_and_update_wrongly_nested_tags() {
 	 *
 	 * @covers next_tag
 	 * @covers remove_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_removing_attributes_works_even_in_malformed_html() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_MALFORMED );
@@ -1015,7 +1035,7 @@ public function test_removing_attributes_works_even_in_malformed_html() {
 		$p->remove_attribute( 'Notifications<' );
 		$this->assertSame(
 			'<div><span class="d-md-none" /span><span class="d-none d-md-inline">Back to notifications</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -1024,7 +1044,7 @@ public function test_removing_attributes_works_even_in_malformed_html() {
 	 *
 	 * @covers next_Tag
 	 * @covers set_attribute
-	 * @covers __toString
+	 * @covers get_updated_html
 	 */
 	public function test_updating_attributes_works_even_in_malformed_html_1() {
 		$p = new WP_HTML_Tag_Processor( self::HTML_MALFORMED );
@@ -1034,7 +1054,7 @@ public function test_updating_attributes_works_even_in_malformed_html_1() {
 		$p->set_attribute( 'id', 'second' );
 		$this->assertSame(
 			'<div><span id="first" class="d-md-none" Notifications</span><span id="second" class="d-none d-md-inline">Back to notifications</span></div>',
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
@@ -1044,7 +1064,7 @@ public function test_updating_attributes_works_even_in_malformed_html_1() {
 	 * @covers next_tag
 	 * @covers set_attribute
 	 * @covers add_class
-	 * @covers __toString
+	 * @covers get_updated_html
 	 *
 	 * @dataProvider data_malformed_tag
 	 */
@@ -1057,7 +1077,7 @@ public function test_updating_attributes_works_even_in_malformed_html_2( $html_i
 		$p->add_class( 'secondTag' );
 		$this->assertSame(
 			$html_expected,
-			(string) $p
+			$p->get_updated_html()
 		);
 	}
 
diff --git a/phpunit/html/wp-html-tag-processor-wp-test.php b/phpunit/html/wp-html-tag-processor-wp-test.php
index 6c3a30340b2677..41008800d0b751 100644
--- a/phpunit/html/wp-html-tag-processor-wp-test.php
+++ b/phpunit/html/wp-html-tag-processor-wp-test.php
@@ -62,7 +62,7 @@ public function test_set_attribute_prevents_xss( $value_to_set, $expected_result
 		 * over the content and because we want to look at the raw values.
 		 */
 		$match = null;
-		preg_match( '~^<div test=(.*)></div>$~', (string) $p, $match );
+		preg_match( '~^<div test=(.*)></div>$~', $p->get_updated_html(), $match );
 		list( , $actual_value ) = $match;
 
 		$this->assertEquals( $actual_value, '"' . $expected_result . '"' );