HTML API: Use case insensitive tag_name comparison in ::next_tag.

The HTML API `::next_tag` method now performs case-insensitive matching when searching for tags by name. For example, searching for 'DIV' will match both '<div>' and '<DIV>' tags.

Reviewed by desrosj.
Merges [59422] to the 6.7 branch.

Props jonsurrell, dmsnell, czapla.
Fixes #62427.

git-svn-id: https://develop.svn.wordpress.org/branches/6.7@59535 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

src/wp-includes/html-api/class-wp-html-processor.php

@@ -557,6 +557,10 @@ public function next_tag( $query = null ): bool {
 			return false;
 		}
 
+		if ( isset( $query['tag_name'] ) ) {
+			$query['tag_name'] = strtoupper( $query['tag_name'] );
+		}
+
 		$needs_class = ( isset( $query['class_name'] ) && is_string( $query['class_name'] ) )
 			? $query['class_name']
 			: null;

tests/phpunit/tests/html-api/wpHtmlProcessor.php

@@ -882,4 +882,19 @@ public function test_ensure_form_tag_closer_token_is_reachable() {
 		$this->assertSame( 'FORM', $processor->get_tag() );
 		$this->assertTrue( $processor->is_tag_closer() );
 	}
+
+	/**
+	 * Ensure that lowercased tag_name query matches tags case-insensitively.
+	 *
+	 * @group 62427
+	 */
+	public function test_next_tag_lowercase_tag_name() {
+		// The upper case <DIV> is irrelevant but illustrates the case-insentivity.
+		$processor = WP_HTML_Processor::create_fragment( '<section><DIV>' );
+		$this->assertTrue( $processor->next_tag( array( 'tag_name' => 'div' ) ) );
+
+		// The upper case <RECT> is irrelevant but illustrates the case-insentivity.
+		$processor = WP_HTML_Processor::create_fragment( '<svg><RECT>' );
+		$this->assertTrue( $processor->next_tag( array( 'tag_name' => 'rect' ) ) );
+	}
 }