HTML parser: allow <hr> to be used inside <select> as a separator

https://bugs.webkit.org/show_bug.cgi?id=80686 rdar://107656886 Reviewed by Ryosuke Niwa. Revive support in the HTML parser for <hr>-in-<select>, thereby making an existing UI feature much more accessible to web developers. This reflects a recent change in the HTML Standard: whatwg/html#9124. * LayoutTests/html5lib/resources/webkit02.dat: These are being upstreamed via html5lib/html5lib-tests#167 and will then be incorporated into web-platform-tests. * Source/WebCore/html/parser/HTMLTreeBuilder.cpp: (WebCore::HTMLTreeBuilder::processStartTag): Canonical link: https://commits.webkit.org/263624@main
annevk · May 3, 2023 · d9e3a62 · d9e3a62
1 parent 0c07f17
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diff --git a/LayoutTests/html5lib/resources/webkit02.dat b/LayoutTests/html5lib/resources/webkit02.dat
@@ -235,3 +235,135 @@ select
 |   <body>
 |     <math math>
 |       definitionURL=""
+
+#data
+<select><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <select>
+|       <hr>
+
+#data
+<select><option><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <select>
+|       <option>
+|       <hr>
+
+#data
+<select><optgroup><option><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <select>
+|       <optgroup>
+|         <option>
+|       <hr>
+
+#data
+<select><optgroup><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <select>
+|       <optgroup>
+|       <hr>
+
+#data
+<select><option><optgroup><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <select>
+|       <option>
+|       <optgroup>
+|       <hr>
+
+#data
+<table><tr><td><select><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <table>
+|       <tbody>
+|         <tr>
+|           <td>
+|             <select>
+|               <hr>
+
+#data
+<table><tr><td><select><option><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <table>
+|       <tbody>
+|         <tr>
+|           <td>
+|             <select>
+|               <option>
+|               <hr>
+
+#data
+<table><tr><td><select><optgroup><option><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <table>
+|       <tbody>
+|         <tr>
+|           <td>
+|             <select>
+|               <optgroup>
+|                 <option>
+|               <hr>
+
+#data
+<table><tr><td><select><optgroup><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <table>
+|       <tbody>
+|         <tr>
+|           <td>
+|             <select>
+|               <optgroup>
+|               <hr>
+
+#data
+<table><tr><td><select><option><optgroup><hr>
+#errors
+#document
+| <html>
+|   <head>
+|   <body>
+|     <table>
+|       <tbody>
+|         <tr>
+|           <td>
+|             <select>
+|               <option>
+|               <optgroup>
+|               <hr>
diff --git a/Source/WebCore/html/parser/HTMLTreeBuilder.cpp b/Source/WebCore/html/parser/HTMLTreeBuilder.cpp
@@ -1424,6 +1424,13 @@ void HTMLTreeBuilder::processStartTag(AtomHTMLToken&& token)
                 processFakeEndTag(TagName::optgroup);
             m_tree.insertHTMLElement(WTFMove(token));
             return;
+        case TagName::hr:
+            if (m_tree.currentStackItem().elementName() == HTML::option)
+                processFakeEndTag(TagName::option);
+            if (m_tree.currentStackItem().elementName() == HTML::optgroup)
+                processFakeEndTag(TagName::optgroup);
+            m_tree.insertSelfClosingHTMLElement(WTFMove(token));
+            return;
         case TagName::select: {
             parseError(token);
             AtomHTMLToken endSelect(HTMLToken::Type::EndTag, TagName::select);