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<title>[58926] trunk: HTML API: Add support for missing FRAMESET and "after" insertion modes.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/58926">58926</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/58926","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dmsnell</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-08-23 15:40:15 +0000 (Fri, 23 Aug 2024)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>HTML API: Add support for missing FRAMESET and "after" insertion modes.

As part of work to add more spec support to the HTML API, this patch adds support for the FRAMESET-related insertion modes, as well as the set of missing after insertion modes. These modes run at the end of parsing a document, closing it and taking care of any lingering tags.

Developed in https://github.com/wordpress/wordpress-develop/7165
Discussed in https://core.trac.wordpress.org/ticket/61576

Props dmsnell, jonsurrell.
See <a href="https://core.trac.wordpress.org/ticket/61576">#61576</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeshtmlapiclasswphtmlprocessorphp">trunk/src/wp-includes/html-api/class-wp-html-processor.php</a></li>
<li><a href="#trunktestsphpunittestshtmlapiwpHtmlProcessorHtml5libphp">trunk/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludeshtmlapiclasswphtmlprocessorphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/html-api/class-wp-html-processor.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/html-api/class-wp-html-processor.php        2024-08-23 14:53:59 UTC (rev 58925)
+++ trunk/src/wp-includes/html-api/class-wp-html-processor.php  2024-08-23 15:40:15 UTC (rev 58926)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3972,7 +3972,71 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool Whether an element was found.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private function step_after_body(): bool {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY . ' state.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $tag_name   = $this->get_token_name();
+               $token_type = $this->get_token_type();
+               $op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
+               $op         = "{$op_sigil}{$tag_name}";
+
+               switch ( $op ) {
+                       /*
+                        * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
+                        * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
+                        *
+                        * > Process the token using the rules for the "in body" insertion mode.
+                        */
+                       case '#text':
+                               $text = $this->get_modifiable_text();
+                               if ( strlen( $text ) === strspn( $text, " \t\n\f\r" ) ) {
+                                       return $this->step_in_body();
+                               }
+                               goto after_body_anything_else;
+                               break;
+
+                       /*
+                        * > A comment token
+                        */
+                       case '#comment':
+                       case '#funky-comment':
+                       case '#presumptuous-tag':
+                               $this->bail( 'Content outside of BODY is unsupported.' );
+                               break;
+
+                       /*
+                        * > A DOCTYPE token
+                        */
+                       case 'html':
+                               // Parse error: ignore the token.
+                               return $this->step();
+
+                       /*
+                        * > A start tag whose tag name is "html"
+                        */
+                       case '+HTML':
+                               return $this->step_in_body();
+
+                       /*
+                        * > An end tag whose tag name is "html"
+                        *
+                        * > If the parser was created as part of the HTML fragment parsing algorithm,
+                        * > this is a parse error; ignore the token. (fragment case)
+                        * >
+                        * > Otherwise, switch the insertion mode to "after after body".
+                        */
+                       case '-HTML':
+                               if ( isset( $this->context_node ) ) {
+                                       return $this->step();
+                               }
+
+                               $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY;
+                               return true;
+               }
+
+               /*
+                * > Parse error. Switch the insertion mode to "in body" and reprocess the token.
+                */
+               after_body_anything_else:
+               $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
+               return $this->step( self::REPROCESS_CURRENT_NODE );
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3991,7 +4055,109 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool Whether an element was found.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private function step_in_frameset(): bool {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET . ' state.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $tag_name   = $this->get_token_name();
+               $token_type = $this->get_token_type();
+               $op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
+               $op         = "{$op_sigil}{$tag_name}";
+
+               switch ( $op ) {
+                       /*
+                        * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
+                        * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
+                        * >
+                        * > Insert the character.
+                        *
+                        * This algorithm effectively strips non-whitespace characters from text and inserts
+                        * them under HTML. This is not supported at this time.
+                        */
+                       case '#text':
+                               $text = $this->get_modifiable_text();
+                               $text = $this->get_modifiable_text();
+                               if ( strlen( $text ) === strspn( $text, " \t\n\f\r" ) ) {
+                                       return $this->step_in_body();
+                               }
+                               $this->bail( 'Non-whitespace characters cannot be handled in frameset.' );
+                               break;
+
+                       /*
+                        * > A comment token
+                        */
+                       case '#comment':
+                       case '#funky-comment':
+                       case '#presumptuous-tag':
+                               $this->insert_html_element( $this->state->current_token );
+                               return true;
+
+                       /*
+                        * > A DOCTYPE token
+                        */
+                       case 'html':
+                               // Parse error: ignore the token.
+                               return $this->step();
+
+                       /*
+                        * > A start tag whose tag name is "html"
+                        */
+                       case '+HTML':
+                               return $this->step_in_body();
+
+                       /*
+                        * > A start tag whose tag name is "frameset"
+                        */
+                       case '+FRAMESET':
+                               $this->insert_html_element( $this->state->current_token );
+                               return true;
+
+                       /*
+                        * > An end tag whose tag name is "frameset"
+                        */
+                       case '-FRAMESET':
+                               /*
+                                * > If the current node is the root html element, then this is a parse error;
+                                * > ignore the token. (fragment case)
+                                */
+                               if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) {
+                                       return $this->step();
+                               }
+
+                               /*
+                                * > Otherwise, pop the current node from the stack of open elements.
+                                */
+                               $this->state->stack_of_open_elements->pop();
+
+                               /*
+                                * > If the parser was not created as part of the HTML fragment parsing algorithm
+                                * > (fragment case), and the current node is no longer a frameset element, then
+                                * > switch the insertion mode to "after frameset".
+                                */
+                               if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) {
+                                       $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET;
+                               }
+
+                               return true;
+
+                       /*
+                        * > A start tag whose tag name is "frame"
+                        *
+                        * > Insert an HTML element for the token. Immediately pop the
+                        * > current node off the stack of open elements.
+                        * >
+                        * > Acknowledge the token's self-closing flag, if it is set.
+                        */
+                       case '+FRAME':
+                               $this->insert_html_element( $this->state->current_token );
+                               $this->state->stack_of_open_elements->pop();
+                               return true;
+
+                       /*
+                        * > A start tag whose tag name is "noframes"
+                        */
+                       case '+NOFRAMES':
+                               return $this->step_in_head();
+               }
+
+               // Parse error: ignore the token.
+               return $this->step();
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4010,7 +4176,67 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool Whether an element was found.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private function step_after_frameset(): bool {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET . ' state.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $tag_name   = $this->get_token_name();
+               $token_type = $this->get_token_type();
+               $op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
+               $op         = "{$op_sigil}{$tag_name}";
+
+               switch ( $op ) {
+                       /*
+                        * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
+                        * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
+                        * >
+                        * > Insert the character.
+                        *
+                        * This algorithm effectively strips non-whitespace characters from text and inserts
+                        * them under HTML. This is not supported at this time.
+                        */
+                       case '#text':
+                               $text = $this->get_modifiable_text();
+                               if ( strlen( $text ) === strspn( $text, " \t\n\f\r" ) ) {
+                                       return $this->step_in_body();
+                               }
+                               $this->bail( 'Non-whitespace characters cannot be handled in after frameset' );
+                               break;
+
+                       /*
+                        * > A comment token
+                        */
+                       case '#comment':
+                       case '#funky-comment':
+                       case '#presumptuous-tag':
+                               $this->insert_html_element( $this->state->current_token );
+                               return true;
+
+                       /*
+                        * > A DOCTYPE token
+                        */
+                       case 'html':
+                               // Parse error: ignore the token.
+                               return $this->step();
+
+                       /*
+                        * > A start tag whose tag name is "html"
+                        */
+                       case '+HTML':
+                               return $this->step_in_body();
+
+                       /*
+                        * > An end tag whose tag name is "html"
+                        */
+                       case '-HTML':
+                               $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET;
+                               return true;
+
+                       /*
+                        * > A start tag whose tag name is "noframes"
+                        */
+                       case '+NOFRAMES':
+                               return $this->step_in_head();
+               }
+
+               // Parse error: ignore the token.
+               return $this->step();
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4029,7 +4255,52 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool Whether an element was found.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private function step_after_after_body(): bool {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY . ' state.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $tag_name   = $this->get_token_name();
+               $token_type = $this->get_token_type();
+               $op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
+               $op         = "{$op_sigil}{$tag_name}";
+
+               switch ( $op ) {
+                       /*
+                        * > A comment token
+                        */
+                       case '#comment':
+                       case '#funky-comment':
+                       case '#presumptuous-tag':
+                               $this->bail( 'Content outside of HTML is unsupported.' );
+                               break;
+
+                       /*
+                        * > A DOCTYPE token
+                        * > A start tag whose tag name is "html"
+                        *
+                        * > Process the token using the rules for the "in body" insertion mode.
+                        */
+                       case 'html':
+                       case '+HTML':
+                               return $this->step_in_body();
+
+                       /*
+                        * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
+                        * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
+                        * >
+                        * > Process the token using the rules for the "in body" insertion mode.
+                        */
+                       case '#text':
+                               $text = $this->get_modifiable_text();
+                               if ( strlen( $text ) === strspn( $text, " \t\n\f\r" ) ) {
+                                       return $this->step_in_body();
+                               }
+                               goto after_after_body_anything_else;
+                               break;
+               }
+
+               /*
+                * > Parse error. Switch the insertion mode to "in body" and reprocess the token.
+                */
+               after_after_body_anything_else:
+               $this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
+               return $this->step( self::REPROCESS_CURRENT_NODE );
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4048,7 +4319,57 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool Whether an element was found.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private function step_after_after_frameset(): bool {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET . ' state.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $tag_name   = $this->get_token_name();
+               $token_type = $this->get_token_type();
+               $op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
+               $op         = "{$op_sigil}{$tag_name}";
+
+               switch ( $op ) {
+                       /*
+                        * > A comment token
+                        */
+                       case '#comment':
+                       case '#funky-comment':
+                       case '#presumptuous-tag':
+                               $this->bail( 'Content outside of HTML is unsupported.' );
+                               break;
+
+                       /*
+                        * > A DOCTYPE token
+                        * > A start tag whose tag name is "html"
+                        *
+                        * > Process the token using the rules for the "in body" insertion mode.
+                        */
+                       case 'html':
+                       case '+HTML':
+                               return $this->step_in_body();
+
+                       /*
+                        * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
+                        * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
+                        * >
+                        * > Process the token using the rules for the "in body" insertion mode.
+                        *
+                        * This algorithm effectively strips non-whitespace characters from text and inserts
+                        * them under HTML. This is not supported at this time.
+                        */
+                       case '#text':
+                               $text = $this->get_modifiable_text();
+                               if ( strlen( $text ) === strspn( $text, " \t\n\f\r" ) ) {
+                                       return $this->step_in_body();
+                               }
+                               $this->bail( 'Non-whitespace characters cannot be handled in after after frameset.' );
+                               break;
+
+                       /*
+                        * > A start tag whose tag name is "noframes"
+                        */
+                       case '+NOFRAMES':
+                               return $this->step_in_head();
+               }
+
+               // Parse error: ignore the token.
+               return $this->step();
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4115,7 +4436,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                         */
</span><span class="cx" style="display: block; padding: 0 10px">                        case '#cdata-section':
</span><span class="cx" style="display: block; padding: 0 10px">                        case '#comment':
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        case '#funky_comment':
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 case '#funky-comment':
+                       case '#presumptuous-tag':
</ins><span class="cx" style="display: block; padding: 0 10px">                                 $this->insert_foreign_element( $this->state->current_token, false );
</span><span class="cx" style="display: block; padding: 0 10px">                                return true;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunittestshtmlapiwpHtmlProcessorHtml5libphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php    2024-08-23 14:53:59 UTC (rev 58925)
+++ trunk/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php      2024-08-23 15:40:15 UTC (rev 58926)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -33,10 +33,13 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'tests1/line0692'        => 'Bug: Mixed whitespace, non-whitespace text in head not split correctly',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests14/line0022'       => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests14/line0055'       => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'tests19/line0488'       => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
+               'tests19/line0500'       => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'tests19/line0965'       => 'Bug: Mixed whitespace, non-whitespace text in head not split correctly.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests19/line1079'       => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests2/line0207'        => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests2/line0686'        => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'tests2/line0697'        => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</ins><span class="cx" style="display: block; padding: 0 10px">                 'tests2/line0709'        => 'Unimplemented: This parser does not add missing attributes to existing HTML or BODY tags.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests5/line0013'        => 'Bug: Mixed whitespace, non-whitespace text in head not split correctly.',
</span><span class="cx" style="display: block; padding: 0 10px">                'tests5/line0077'        => 'Bug: Mixed whitespace, non-whitespace text in head not split correctly.',
</span></span></pre>
</div>
</div>

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