1. Following pages contain content outside of a landmark region.

api/overview-summary.html
api/*/module-frame.html
api/module-overview-frame.html
api/overview-frame.html
api/allclasses-noframe.html

2. Low contrast. See attached screenshots
docs/api/constant-values.html

3. Heading order invalid
docs/api/*/module-summary.html
<h3>Packages</h3>
<h3>Services</h3>

api/java.base/java/lang/invoke/VarHandle.html
javadoc renders <h2> header <h2 title="Class VarHandle" class="title">Class VarHandle</h2>
there is no <h1> header.
api/java.base/java/lang/invoke/package-summary.html is rendered correctly <h1 title="Package" class="title">Package&nbsp;java.lang.invoke</h1>

Once <h2> is fixed there are will be another issues for "Method Summary", "Field Summary", "Nested Class Summary", etc which are rendered as <h3>.