note: ┌─ test.html:1:17 │ 1 │ this is a tag: <h1>test</h1> │ ^^ ^^ end tag │ │ │ start tag · 5 │ Attribute values can be quoted: <input name = 'age' type = "number"> │ ^^^^ ^^^ ^^^^ ^^^^^^ attr value │ │ │ │ │ │ │ attr name │ │ attr value │ attr name 6 │ 7 │ But you cannot put attributes everywhere: </nope data=foobar> │ ^^^^ end-tag-with-attributes 8 │ 9 │ Please mind the gap: < test │ ^ invalid-first-character-of-tag-name 10 │ 11 │ The pirate says &arrrrr; │ ^ unknown-named-character-reference 12 │ 13 │ Does this open two pages? <a href=foo.html href=bar.html>click me</a> │ ^^^^ duplicate-attribute 14 │ 15 │ Do you start or do you end? </yes/> │ ^ end-tag-with-trailing-solidus