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sub nested within elements, elements nested within sub

Classified as: flow content, phrasing content, palpable content

Parents, sub

Children, sup

Examples: sub parents, sub children

Valid Syntax 1
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16		<!doctype html>
<html>
<head>
<title>...</title>
</head>
<body>

<p>
<sub>
...
</sub>
</p>
<sub>...</sub>

</body>
</html>
Valid Syntax 2
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17		<!doctype html>
<html>
<head>
<title>...</title>
</head>
<body>

<p>
<sub>
<b>
...
</b>
</sub>
</p>

</body>
</html>
Invalid Syntax 3
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16		<!doctype html>
<html>
<head>
<title>...</title>
<sub>...</sub>
</head>
<body>

<sub>
<article>
...
</article>
</sub>

</body>
</html>

Syntax 1: Valid, sub element nested within p, body: allowed
Syntax 2: Valid, b nested within sub: allowed
Syntax 3: Invalid, sub nested within head: not allowed; article nested within sub: not allowed

sub intro sub browser display sub syntax