url = "https://youtu.be/QH2-TGUlwu4";
VID_REGEX = /(?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/
var yt_video_id = url.match(VID_REGEX)[1];
var embed_code = '<iframe width="590" height="443" src="//www.youtube.com/embed/'+yt_video_id+'?showinfo=0&&rel=0&color=white&modestbranding=1&iv_load_policy=3" frameborder="0"></iframe>';
prompt('Copie o Embed código para o WMO:',embed_code);
/* use nos favoritos para embed personalizado
javascript:prompt('Copie o Embed código para o WMO:','<iframe width="590" height="443" src="//www.youtube.com/embed/'+window.location.href.match(/(?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/)[1]+'?showinfo=0&&rel=0&color=white&modestbranding=1&iv_load_policy=3" frameborder="0"></iframe>');location.reload();
*/
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