WP_HTML_Processor::step_initial(): bool

Source

		isset( $serialized_attribute_name[0] ) &&
		'=' === $serialized_attribute_name[0]
	) {
		$html .= '=""';
	}

	$html .= " {$serialized_attribute_name}";
	$value = $this->get_attribute( $attribute_name );

	if ( is_string( $value ) ) {
		$html .= '="' . self::escape_text_for_serialization( $value ) . '"';
	}

	$previous_attribute_was_true = true === $value;
}

if ( ! $in_html && $this->has_self_closing_flag() ) {
	$html .= ' /';
}

$html .= '>';

/*
 * The HTML parser strips a leading newline immediately after the start
 * tag of TEXTAREA, PRE, and LISTING elements in HTML content. When serializing,
 * prepend a leading newline to ensure the semantic HTML content is preserved.
 *
 * For example, `<pre>\n\nX</pre>` must not become `<pre>\nX</pre>` because its content
 * has changed. However, `<pre>X</pre>` and `<pre>\nX</pre>` are _equivalent_.
 *
 * > A start tag whose tag name is "textarea"
 * >   …
 * >   If the next token is a U+000A LINE FEED (LF) character token, then ignore
 * >   that token and move on to the next one. (Newlines at the start of textarea
 * >   elements are ignored as an authoring convenience.)
 *
 * > A start tag whose tag name is one of: "pre", "listing"
 * >   …
 * >   If the next token is a U+000A LINE FEED (LF) character token, then ignore
 * >   that token and move on to the next one. (Newlines at the start of pre blocks
 * >   are ignored as an authoring convenience.)
 *
 * @see https://html.spec.whatwg.org/multipage/parsing.html
 */
if ( $in_html && ( 'TEXTAREA' === $tag_name || 'PRE' === $tag_name || 'LISTING' === $tag_name ) ) {
	$html .= "\n";
}

// Flush out self-contained elements.
if ( $in_html && in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) {
	$text = $this->get_modifiable_text();

	switch ( $tag_name ) {
		case 'IFRAME':
		case 'NOEMBED':

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