#data
<div xmlns="http://www.w3.org/1999/xhtml">
  <picture/>
</div>
#errors
/div;no significant content;s
/div/picture;child element missing;img;m

#data
<div xmlns="http://www.w3.org/1999/xhtml">
  <picture><img src="a" alt="b"/></picture>
</div>
#errors
/div;no significant content;s

#data
<span xmlns="http://www.w3.org/1999/xhtml">
  <picture><img src="a" alt="b"/></picture>
</span>
#errors
/span;no significant content;s

#data
<template xmlns="http://www.w3.org/1999/xhtml">
  <picture><img src="a" alt="b"/></picture>
</template>
#errors