Understanding HTML's mysterious Void elements
HTML has several void elements. These cannot have any content, and cannot have separate closing tags.
<br><hr><img><input><link><meta><area><base><col><embed><param><source><track>
Closing a void element like this is invalid html.
html
<img alt></img>Void elements can optionally be self-closing, so these are both correct and identical.
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<img alt><img alt />
