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+ ```
+ % pandoc -f html -t djot
+<h1 id="foo" class="a b">Hi</hi>
+^D
+{#foo .a .b}
+# Hi
+```
+
+In this one the id is suppressed by the djot writer because
+the same one would be automatically generated by the djot reader:
+```
+% pandoc -f html -t djot
+<h2 id="Introduction">Introduction</h2>
+^D
+## Introduction
+```