Access 3.5.1.1

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Access: [3.5.1.1]: headers improperly nested (Priority 2)

Cause:

Organize or "nest" headers in an ordered and logical fashion. Headers that are not structured in sequential order or those used to apply font effects can creating difficulties in navigation and comprehension for the visually impaired.

Example:

Bad
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
<title>aert1.0/3.5.1</title>
</head>
<body>
<h1>First Heading</h1>
<h3>Next Heading</h3>
</body>
</html>

Solution:

References: