diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessorModifiableText.php b/tests/phpunit/tests/html-api/wpHtmlProcessorModifiableText.php
index 40627b76fa5e1..a73137a21e3d5 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessorModifiableText.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessorModifiableText.php
@@ -27,6 +27,56 @@ public function test_modifiable_text_special_textarea() {
);
}
+ /**
+ * TEXTAREA elements ignore the first newline in their content.
+ * Setting the modifiable text with a leading carriage return should be normalized
+ * and ensure the leading newline is present in the resulting TEXTAREA.
+ *
+ * @ticket 64609
+ */
+ public function test_modifiable_text_special_textarea_carriage_return() {
+ $processor = WP_HTML_Processor::create_fragment( '' );
+ $processor->next_token();
+ $processor->set_modifiable_text( "\rCR" );
+ // Newline normalization transforms \r into \n, and special handling should preserve it.
+ $this->assertSame(
+ "\nCR",
+ $processor->get_modifiable_text(),
+ 'Should have normalized carriage return and preserved the leading newline in the TEXTAREA content.'
+ );
+ $this->assertEqualHTML(
+ "",
+ $processor->get_updated_html(),
+ '',
+ 'Should have doubled the newline in the output HTML to preserve the leading newline.'
+ );
+ }
+
+ /**
+ * TEXTAREA elements ignore the first newline in their content.
+ * Setting the modifiable text with a leading carriage return + newline should be normalized
+ * and ensure the leading newline is present in the resulting TEXTAREA.
+ *
+ * @ticket 64609
+ */
+ public function test_modifiable_text_special_textarea_carriage_return_newline() {
+ $processor = WP_HTML_Processor::create_fragment( '' );
+ $processor->next_token();
+ $processor->set_modifiable_text( "\r\nCR-N" );
+ // Newline normalization transforms \r\n into \n, and special handling should preserve it.
+ $this->assertSame(
+ "\nCR-N",
+ $processor->get_modifiable_text(),
+ 'Should have normalized carriage return + newline and preserved the leading newline in the TEXTAREA content.'
+ );
+ $this->assertEqualHTML(
+ "",
+ $processor->get_updated_html(),
+ '',
+ 'Should have doubled the newline in the output HTML to preserve the leading newline.'
+ );
+ }
+
/**
* PRE and LISTING elements ignore the first newline in their content.
* Setting the modifiable text with a leading newline should ensure that the leading newline