HTML API: Replace associative array for tracking parsed attributes.

my.bootstrap.php

@@ -0,0 +1,16 @@
+<?php
+
+// Core stuff.
+require_once __DIR__ . '/wp-test-config.php';
+wp_cache_init();
+require_wp_db();
+
+require_once __DIR__ . '/tests/phpunit/includes/phpunit-adapter-testcase.php';
+require_once __DIR__ . '/tests/phpunit/includes/abstract-testcase.php';
+require_once __DIR__ . '/tests/phpunit/includes/testcase.php';
+require_once __DIR__ . '/tests/phpunit/includes/functions.php';
+
+if ( ! defined( 'DIR_TESTDATA' ) ) {
+	define( 'DIR_TESTDATA', __DIR__ . '/tests/phpunit/data' );
+}
+

my.phpunit.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<phpunit
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/9.2/phpunit.xsd"
+	bootstrap="my.bootstrap.php"
+	testdox="true"
+	colors="true"
+>
+	<php>
+		<const name="WP_TESTS_DOMAIN" value="example.org"/>
+    </php>
+	<testsuites>
+		<testsuite name="formatting">
+			<directory suffix=".php">tests/phpunit/tests/formatting</directory>
+		</testsuite>
+		<testsuite name="kses">
+			<file>tests/phpunit/tests/kses.php</file>
+		</testsuite>
+		<testsuite name="html-api">
+			<directory suffix=".php">tests/phpunit/tests/html-api</directory>
+		</testsuite>
+	</testsuites>
+</phpunit>

src/wp-includes/html-api/class-wp-html-attribute-token.php

@@ -21,13 +21,14 @@
  */
 class WP_HTML_Attribute_Token {
 	/**
-	 * Attribute name.
+	 * Byte length of attribute name.
 	 *
 	 * @since 6.2.0
+	 * @since 6.5.0
 	 *
-	 * @var string
+	 * @var int
 	 */
-	public $name;
+	public $name_length;
 
 	/**
 	 * Attribute value.
@@ -97,16 +98,17 @@ class WP_HTML_Attribute_Token {
 	 *
 	 * @since 6.2.0
 	 * @since 6.5.0 Replaced `end` with `length` to more closely match `substr()`.
-	 *
-	 * @param string $name         Attribute name.
-	 * @param int    $value_start  Attribute value.
-	 * @param int    $value_length Number of bytes attribute value spans.
-	 * @param int    $start        The string offset where the attribute name starts.
-	 * @param int    $length       Byte length of the entire attribute name or name and value pair expression.
-	 * @param bool   $is_true      Whether the attribute is a boolean attribute with true value.
+	 *              Replaced `name` with `name_length` to avoid string allocation.
+	 *
+	 * @param int  $name_length  Byte length of attribute name.
+	 * @param int  $value_start  Attribute value.
+	 * @param int  $value_length Number of bytes attribute value spans.
+	 * @param int  $start        The string offset where the attribute name starts.
+	 * @param int  $length       Byte length of the entire attribute name or name and value pair expression.
+	 * @param bool $is_true      Whether the attribute is a boolean attribute with true value.
 	 */
-	public function __construct( $name, $value_start, $value_length, $start, $length, $is_true ) {
-		$this->name            = $name;
+	public function __construct( $name_length, $value_start, $value_length, $start, $length, $is_true ) {
+		$this->name_length     = $name_length;
 		$this->value_starts_at = $value_start;
 		$this->value_length    = $value_length;
 		$this->start           = $start;