2 <!DOCTYPE html><html><body><xyz:abc></xyz:abc>
12 <!DOCTYPE html><html><body><xyz:abc></xyz:abc><span></span>
23 <!DOCTYPE html><html><html abc:def=gh><xyz:abc></xyz:abc>
25 15: Unexpected start tag html
35 <!DOCTYPE html><html xml:lang=bar><html xml:lang=foo>
37 15: Unexpected start tag html
46 <!DOCTYPE html><html 123=456>
56 <!DOCTYPE html><html 123=456><html 789=012>
67 <!DOCTYPE html><html><body 789=012>