#data
<!DOCTYPE html><html><body><xyz:abc></xyz:abc>
#errors
#document
| <!DOCTYPE html>
| <html>
| <head>
| <body>
| <xyz:abc>
#data
<!DOCTYPE html><html><body><xyz:abc></xyz:abc><span></span>
#errors
#document
| <!DOCTYPE html>
| <html>
| <head>
| <body>
| <xyz:abc>
| <span>
#data
<!DOCTYPE html><html><html abc:def=gh><xyz:abc></xyz:abc>
#errors
(1,38): non-html-root
#document
| <!DOCTYPE html>
| <html>
| abc:def="gh"
| <head>
| <body>
| <xyz:abc>
#data
<!DOCTYPE html><html xml:lang=bar><html xml:lang=foo>
#errors
(1,53): non-html-root
#document
| <!DOCTYPE html>
| <html>
| xml:lang="bar"
| <head>
| <body>
#data
<!DOCTYPE html><html 123=456>
#errors
#document
| <!DOCTYPE html>
| <html>
| 123="456"
| <head>
| <body>
#data
<!DOCTYPE html><html 123=456><html 789=012>
#errors
(1,43): non-html-root
#document
| <!DOCTYPE html>
| <html>
| 123="456"
| 789="012"
| <head>
| <body>
#data
<!DOCTYPE html><html><body 789=012>
#errors
#document
| <!DOCTYPE html>
| <html>
| <head>
| <body>
| 789="012"