Documentation of %isHeadElement is misleading

[PhilterPaper]

Originally opened by "bkb" 2015-11-16 as RT 109044 "Documentation of %isHeadElement is misleading". Please close the RT ticket.

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The documentation for %isHeadElement claims

This hashset contains all elements that elements that should be
present only in the 'head' element of an HTML document.

However, %isHeadElement contains tags like <script> which may be present either in the head or the body section of an HTML document.

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I fixed this in PhilterPaper/HTML-Tagset by changing the POD and code:

=head2 hashset %HTML::Tagset::isHeadElement

This hashset contains all elements that elements that may be
present in the 'head' element of an HTML document. Some, such as <script>,
may also by in the 'body'.

=cut

our %isHeadElement = (
  map {; $_ => 1 } qw(
    title 
    base basefont
    link 
    meta 
    object 
  ),
  %isHeadOrBodyElement,
);