editor.setOption('extraKeys', {
// bold
'Ctrl-B': function(cm) {
var s = cm.getSelection(),
t = s.slice(0, 3) === '<b>' && s.slice(-4) === '</b>';
cm.replaceSelection(t ? s.slice(3).slice(0, -4) : '<b>' + s + '</b>', 'around');
},
// italic
'Ctrl-I': function(cm) {
var s = cm.getSelection(),
t = s.slice(0, 3) === '<i>' && s.slice(-4) === '</i>';
cm.replaceSelection(t ? s.slice(3).slice(0, -4) : '<i>' + s + '</i>', 'around');
},
// underline
'Ctrl-U': function(cm) {
var s = cm.getSelection(),
t = s.slice(0, 3) === '<u>' && s.slice(-4) === '</u>';
cm.replaceSelection(t ? s.slice(3).slice(0, -4) : '<u>' + s + '</u>', 'around');
},
// code
'Ctrl-K': function(cm) {
var s = cm.getSelection(),
t = s.slice(0, 6) === '<code>' && s.slice(-7) === '</code>';
cm.replaceSelection(t ? s.slice(6).slice(0, -7) : '<code>' + s + '</code>', 'around');
},
// strike
'Delete': function(cm) {
var s = cm.getSelection(),
t = s.slice(0, 5) === '<del>' && s.slice(-6) === '</del>';
if (!s || s === '<del></del>') return null;
cm.replaceSelection(t ? s.slice(5).slice(0, -6) : '<del>' + s + '</del>', 'around');
}
});
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