wp-includes/html-api/class-wp-html-doctype-info.php:183Constructor.
$namestring|null$public_identifierstring|null$system_identifierstring|null$force_quirks_flagbool private function __construct( ?string $name, ?string $public_identifier, ?string $system_identifier, bool $force_quirks_flag ) { $this->name = $name; $this->public_identifier = $public_identifier; $this->system_identifier = $system_identifier; /* * > If the DOCTYPE token matches one of the conditions in the following list, * > then set the Document to quirks mode: */ /* * > The force-quirks flag is set to on. */ if ( $force_quirks_flag ) { $this->indicated_compatibility_mode = 'quirks'; return; } /* * Normative documents will contain the literal `<!DOCTYPE html>` with no * public or system identifiers; short-circuit to avoid extra parsing. */ if ( 'html' === $name && null === $public_identifier && null === $system_identifier ) { $this->indicated_compatibility_mode = 'no-quirks'; return; } /* * > The name is not "html". * * The tokenizer must report the name in lower case even if provided in * the document in upper case; thus no conversion is required here. */ if ( 'html' !== $name ) { $this->indicated_compatibility_mode = 'quirks'; return; } /* * Set up some variables to handle the rest of the conditions. * * > set...the public identifier...to...the empty string if the public identifier was missing. * > set...the system identifier...to...the empty string if the system identifier was missing. * > * > The system identifier and public identifier strings must be compared... * > in an ASCII case-insensitive manner. */ $public_identifier = null === $public_identifier ? '' : strtolower( $public_identifier ); $system_identifier = null === $system_identifier ? '' : strtolower( $system_identifier ); /* * > The public identifier is set to… */ if ( '-//w3o//dtd w3 html strict 3.0//en//' === $public_identifier || '-/w3c/dtd html 4.0 transitional/en' === $public_identifier || 'html' === $public_identifier ) { $this->indicated_compatibility_mode = 'quirks'; return; } /* * > The system identifier is set to… */ if ( 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd' === $system_identifier ) { $this->indicated_compatibility_mode = 'quirks'; return; } /* * All of the following conditions depend on matching the public identifier. * If the public identifier is empty, none of the following conditions will match. */ if ( '' === $public_identifier ) {Introduced in 6.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/html-api/class-wp-html-doctype-info.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.