diff --git a/tree-construction/search-element.dat b/tree-construction/search-element.dat
new file mode 100644
index 0000000..2866d7e
--- /dev/null
+++ b/tree-construction/search-element.dat
@@ -0,0 +1,46 @@
+#data
+<!doctype html><p>foo<search>bar<p>baz
+#errors
+(1,38): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       "foo"
+|     <search>
+|       "bar"
+|       <p>
+|         "baz"
+
+#data
+<!doctype html><search><p>foo</search>bar
+#errors
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <search>
+|       <p>
+|         "foo"
+|     "bar"
+
+#data
+<!DOCTYPE html>xxx<svg><x><g><a><search><b>
+#errors
+ * (1,44) unexpected HTML-like start tag token in foreign content
+ * (1,44) unexpected end of file
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     "xxx"
+|     <svg svg>
+|       <svg x>
+|         <svg g>
+|           <svg a>
+|             <svg search>
+|     <b>
diff --git a/tree-construction/tests20.dat b/tree-construction/tests20.dat
index 1bfd130..30bc408 100644
--- a/tree-construction/tests20.dat
+++ b/tree-construction/tests20.dat
@@ -25,6 +25,32 @@
 |       <button>
 |         <address>
 
+#data
+<!doctype html><p><button><article>
+#errors
+(1,36): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <article>
+
+#data
+<!doctype html><p><button><aside>
+#errors
+(1,34): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <aside>
+
 #data
 <!doctype html><p><button><blockquote>
 #errors
@@ -38,6 +64,175 @@
 |       <button>
 |         <blockquote>
 
+#data
+<!doctype html><p><button><center>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <center>
+
+#data
+<!doctype html><p><button><details>
+#errors
+(1,36): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <details>
+
+#data
+<!doctype html><p><button><dialog>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <dialog>
+
+#data
+<!doctype html><p><button><dir>
+#errors
+(1,32): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <dir>
+
+#data
+<!doctype html><p><button><div>
+#errors
+(1,32): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <div>
+
+#data
+<!doctype html><p><button><dl>
+#errors
+(1,31): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <dl>
+
+#data
+<!doctype html><p><button><fieldset>
+#errors
+(1,37): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <fieldset>
+
+#data
+<!doctype html><p><button><figcaption>
+#errors
+(1,39): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <figcaption>
+
+#data
+<!doctype html><p><button><figure>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <figure>
+
+#data
+<!doctype html><p><button><footer>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <footer>
+
+#data
+<!doctype html><p><button><header>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <header>
+
+#data
+<!doctype html><p><button><hgroup>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <hgroup>
+
+#data
+<!doctype html><p><button><main>
+#errors
+(1,33): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <main>
+
 #data
 <!doctype html><p><button><menu>
 #errors
@@ -51,6 +246,32 @@
 |       <button>
 |         <menu>
 
+#data
+<!doctype html><p><button><nav>
+#errors
+(1,32): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <nav>
+
+#data
+<!doctype html><p><button><ol>
+#errors
+(1,31): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <ol>
+
 #data
 <!doctype html><p><button><p>
 #errors
@@ -64,6 +285,45 @@
 |       <button>
 |         <p>
 
+#data
+<!doctype html><p><button><search>
+#errors
+(1,35): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <search>
+
+#data
+<!doctype html><p><button><section>
+#errors
+(1,36): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <section>
+
+#data
+<!doctype html><p><button><summary>
+#errors
+(1,36): expected-closing-tag-but-got-eof
+#document
+| <!DOCTYPE html>
+| <html>
+|   <head>
+|   <body>
+|     <p>
+|       <button>
+|         <summary>
+
 #data
 <!doctype html><p><button><ul>
 #errors
