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as the B<state> otherwise -- evaluated for truth, so a decoded-JSON boolean
works as well as a plain C<1> or C<0>. C<uncheck> has no state argument, so a
non-coderef there is a mistyped callback and croaks.

=head2 hover

    $el->hover($cb);

Dispatches the pointer/mouse sequence an entering cursor produces:
C<pointerover>/C<mouseover> (which bubble), then C<pointerenter>/C<mouseenter>
(which do not), then C<mousemove>, positioned at the element's centre. Menus
and tooltips listen for various of these, so dispatching only C<mouseover>
leaves a menu that opens on C<mouseenter> shut. These are synthetic events:
C<isTrusted> is false, so a page that checks it is not fooled.

=head2 box

    $el->box($cb);   # $cb->($box, $err)

The element's geometry as a hashref: C<x>, C<y>, C<width>, C<height>, C<top>,
C<left>, C<bottom>, C<right> -- viewport-relative, exactly as