There are a number of problems reported by tidy which should be fixed:

/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/java/awt/event/MouseEvent.html:1249: id not found: button
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/JOptionPane.html:1938: name already declared: message
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/SpinnerNumberModel.html:624: id not found: setMinimum(java.lang.Comparable)
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/package-use.html:1404: name already declared: ../../javax/swing/jtree_description
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/package-use.html:1705: name already declared: ../../javax/swing/jtree_description
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/package-use.html:2098: name already declared: ../../javax/swing/jtree_description
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/package-use.html:2611: name already declared: ../../javax/swing/jtree_description
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/JComponent.html:358: id not found: package_description
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/text/Document.html:283: id not found: removeUndoableEditListener(javax.swing.event.UndoableEditListener)
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/text/Document.html:281: id not found: removeDocumentListener(javax.swing.event.DocumentListener)
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/text/Document.html:282: id not found: addUndoableEditListener(javax.swing.event.UndoableEditListener)
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/text/Document.html:280: id not found: addDocumentListener(javax.swing.event.DocumentListener)
/w/jjg/work/jdk10.closed/build/linux-x86_64-normal-server-release/images/docs/api/javax/swing/tree/DefaultTreeCellEditor.EditorContainer.html:353: name already declared: EditorContainer--

The next external links should be checked as well:
http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
http://partners.adobe.com/public/developer/en/tiff/TIFFPM6.pdf
http://partners.adobe.com/public/developer/en/tiff/TIFFphotoshop.pdf
https://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
http://developer.apple.com/mac/library/documentation/General/Reference/InfoPlistKeyReference
http://bugreport.java.com/bugreport/
https://msdn.microsoft.com/en-us/library/dd183391.aspx
http://www.microsoft.com/typography/otspec/
http://docs.oracle.com/javase/tutorial/
http://docs.oracle.com/javase/tutorial/extra/fullscreen/index.html
http://docs.oracle.com/javase/tutorial/javabeans/
http://docs.oracle.com/javase/tutorial/javabeans/writing/properties.html
http://docs.oracle.com/javase/tutorial/uiswing/
http://docs.oracle.com/javase/tutorial/uiswing/components/applet.html
http://docs.oracle.com/javase/tutorial/uiswing/components/border.html
http://docs.oracle.com/javase/tutorial/uiswing/components/button.html
http://docs.oracle.com/javase/tutorial/uiswing/components/colorchooser.html
http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html
http://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html
http://docs.oracle.com/javase/tutorial/uiswing/components/filechooser.html
http://docs.oracle.com/javase/tutorial/uiswing/components/frame.html
http://docs.oracle.com/javase/tutorial/uiswing/components/generaltext.html
http://docs.oracle.com/javase/tutorial/uiswing/components/icon.html
http://docs.oracle.com/javase/tutorial/uiswing/components/internalframe.html
http://docs.oracle.com/javase/tutorial/uiswing/components/jcomponent.html
http://docs.oracle.com/javase/tutorial/uiswing/components/label.html
http://docs.oracle.com/javase/tutorial/uiswing/components/layeredpane.html
http://docs.oracle.com/javase/tutorial/uiswing/components/list.html
http://docs.oracle.com/javase/tutorial/uiswing/components/menu.html
http://docs.oracle.com/javase/tutorial/uiswing/components/panel.html
http://docs.oracle.com/javase/tutorial/uiswing/components/progress.html
http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html
http://docs.oracle.com/javase/tutorial/uiswing/components/scrollpane.html
http://docs.oracle.com/javase/tutorial/uiswing/components/slider.html
http://docs.oracle.com/javase/tutorial/uiswing/components/spinner.html
http://docs.oracle.com/javase/tutorial/uiswing/components/splitpane.html
http://docs.oracle.com/javase/tutorial/uiswing/components/tabbedpane.html
http://docs.oracle.com/javase/tutorial/uiswing/components/table.html
http://docs.oracle.com/javase/tutorial/uiswing/components/text.html
http://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html
http://docs.oracle.com/javase/tutorial/uiswing/components/toolbar.html
http://docs.oracle.com/javase/tutorial/uiswing/components/tooltip.html
http://docs.oracle.com/javase/tutorial/uiswing/components/toplevel.html
http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html
http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html
http://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html
http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/containerlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/index.html
http://docs.oracle.com/javase/tutorial/uiswing/events/internalframelistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/itemlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/mouselistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/treeexpansionlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/treemodellistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/treeselectionlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/treewillexpandlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/events/windowlistener.html
http://docs.oracle.com/javase/tutorial/uiswing/index.html
http://docs.oracle.com/javase/tutorial/uiswing/layout/box.html
http://docs.oracle.com/javase/tutorial/uiswing/layout/spring.html
http://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
http://docs.oracle.com/javase/tutorial/uiswing/misc/action.html
http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html
http://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html
http://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html
https://docs.oracle.com/javase/tutorial/2d/text/fonts.html
https://docs.oracle.com/javase/tutorial/index.html
https://docs.oracle.com/javase/tutorial/sound/
https://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html
https://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
http://www.oracle.com/pls/topic/lookup?ctx=javase9&id=homepage
http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html
http://www.oracle.com/technetwork/java/architecture-142923.html
http://www.oracle.com/technetwork/java/hig-136467.html
http://www.oracle.com/technetwork/java/javase/documentation/spec-136004.html
http://www.oracle.com/technetwork/java/javase/migratingfromapplets-2872444.pdf
http://www.oracle.com/technetwork/java/javase/tech/articles-jsp-139072.html
http://www.oracle.com/technetwork/java/javase/tech/index-jsp-142216.html
http://www.oracle.com/technetwork/java/javase/terms/license/java9speclicense.html
http://www.oracle.com/technetwork/java/javase/training/index.html
http://www.oracle.com/technetwork/java/painting-140037.html
http://www.oracle.com/technetwork/java/persistence2-141443.html
http://www.oracle.com/technetwork/java/persistence3-139471.html
http://www.oracle.com/technetwork/java/persistence4-140124.html
http://www.oracle.com/technetwork/java/redist-137594.html
https://www.oracle.com/pls/topic/lookup?ctx=javase9&id=i18n_overview
https://www.oracle.com/pls/topic/lookup?ctx=javase9&id=imf_overview
ftp://ftp.sgi.com/graphics/tiff/TTN2.draft.txt
http://bugs.sun.com/view_bug.do?bug_id=4030718
http://bugs.sun.com/view_bug.do?bug_id=4465537
http://bugs.sun.com/view_bug.do?bug_id=4515058
http://bugs.sun.com/view_bug.do?bug_id=4671025
http://java.sun.com/products/jfc/tsc/articles/text/element_interface
http://java.sun.com/products/jfc/tsc/articles/timer/
http://www.sun.com/access
https://help.ubuntu.com/community/UnityLaunchersAndDesktopFiles
http://openjdk.java.net/jeps/289
http://www.color.org
http://www.color.org/ICC1V42.pdf
http://www.exif.org/Exif2-2.PDF
http://www.iana.org/assignments/media-types/
http://www.iana.org/assignments/uri-schemes.html
http://tools.ietf.org/html/rfc2306.html
https://tools.ietf.org/html/rfc1950
https://tools.ietf.org/html/rfc1951
http://www.ietf.org/rfc/rfc1952.txt
http://www.ietf.org/rfc/rfc2045.txt
http://www.ietf.org/rfc/rfc2046.txt
http://www.ietf.org/rfc/rfc2278.txt
http://www.ietf.org/rfc/rfc2368.txt
http://www.ietf.org/rfc/rfc2911.txt
http://www.jpeg.org
http://www.libpng.org/pub/png/spec/
http://www.midi.org
ftp://ftp.pwg.org/pub/pwg/standards/pwg5100.3.pdf
http://www.unicode.org/
http://www.w3.org/Graphics/GIF/spec-gif89a.txt
http://www.w3.org/TR/CSS21/syndata.html
http://www.w3.org/TR/REC-CSS1
http://www.w3.org/TR/REC-html32.html
http://www.w3.org/pub/WWW/Graphics/Color/sRGB.html
http://www.wapforum.org/what/technical/SPEC-WAESpec-19990524.pdf
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