I've made a userscript to add hover to show spoiler to all spoilers:
$('.spoiler').prepend("<div id='isSpoiler' style='color:red; font-size:smaller; float:right;'>hover to show spoiler<div>"); $('.spoiler').hover(function () { $(this).find('#isSpoiler').hide(500); }, function () { $(this).find('#isSpoiler').show(500); }); I've added it to my Optional Features userscriptOptional Features userscript.
