WP_HTML_Processor::step_in_head(): bool

1769	private function step_in_head(): bool {1770		$token_name = $this->get_token_name();1771		$token_type = $this->get_token_type();1772		$is_closer  = parent::is_tag_closer();1773		$op_sigil   = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : '';1774		$op         = "{$op_sigil}{$token_name}";1775 1776		switch ( $op ) {1777			case '#text':1778				/*1779				 * > A character token that is one of U+0009 CHARACTER TABULATION,1780				 * > U+000A LINE FEED (LF), U+000C FORM FEED (FF),1781				 * > U+000D CARRIAGE RETURN (CR), or U+0020 SPACE1782				 */1783				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {1784					// Insert the character.1785					$this->insert_html_element( $this->state->current_token );1786					return true;1787				}1788 1789				goto in_head_anything_else;1790				break;1791 1792			/*1793			 * > A comment token1794			 */1795			case '#comment':1796			case '#funky-comment':1797			case '#presumptuous-tag':1798				$this->insert_html_element( $this->state->current_token );1799				return true;1800 1801			/*1802			 * > A DOCTYPE token1803			 */1804			case 'html':1805				// Parse error: ignore the token.1806				return $this->step();1807 1808			/*1809			 * > A start tag whose tag name is "html"1810			 */1811			case '+HTML':1812				return $this->step_in_body();1813 1814			/*1815			 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link"1816			 */1817			case '+BASE':1818			case '+BASEFONT':1819			case '+BGSOUND':1820			case '+LINK':1821				$this->insert_html_element( $this->state->current_token );1822				return true;1823 1824			/*1825			 * > A start tag whose tag name is "meta"1826			 */1827			case '+META':1828				$this->insert_html_element( $this->state->current_token );1829 1830				// All following conditions depend on "tentative" encoding confidence.1831				if ( 'tentative' !== $this->state->encoding_confidence ) {1832					return true;1833				}1834 1835				/*1836				 * > If the active speculative HTML parser is null, then:1837				 * >   - If the element has a charset attribute, and getting an encoding from1838				 * >     its value results in an encoding, and the confidence is currently1839				 * >     tentative, then change the encoding to the resulting encoding.1840				 */1841				$charset = $this->get_attribute( 'charset' );1842				if ( is_string( $charset ) ) {1843					$this->bail( 'Cannot yet process META tags with charset to determine encoding.' );1844				}1845 1846				/*1847				 * >   - Otherwise, if the element has an http-equiv attribute whose value is1848				 * >     an ASCII case-insensitive match for the string "Content-Type", and