#data
<isindex>
#errors
(1,9): expected-doctype-but-got-start-tag
(1,9): expected-closing-tag-but-got-eof
#document
| <html>
|   <head>
|   <body>
|     <isindex>

#data
<isindex name="A" action="B" prompt="C" foo="D">
#errors
(1,48): expected-doctype-but-got-start-tag
(1,48): expected-closing-tag-but-got-eof
#document
| <html>
|   <head>
|   <body>
|     <isindex>
|       action="B"
|       foo="D"
|       name="A"
|       prompt="C"

#data
<form><isindex>
#errors
(1,6): expected-doctype-but-got-start-tag
(1,15): expected-closing-tag-but-got-eof
#document
| <html>
|   <head>
|   <body>
|     <form>
|       <isindex>

#data
<!doctype html><isindex>x</isindex>x
#errors
#document
| <!DOCTYPE html>
| <html>
|   <head>
|   <body>
|     <isindex>
|       "x"
|     "x"