drop on* attributes 1
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## Hello {#abc .intro onclick=alert("Hello")}
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<h2 id="abc" class="intro">Hello</h2>
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drop on* attributes 2
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## Hello {#ca .intro onclick=alert('Hello') style="color: red" .c1 onhover=alert('hihi') .c3}
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<h2 id="ca" style="color: red" class="intro c1 c3">Hello</h2>
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