code: function toggleHTMLComment(editor) {
  		/** @type Range */
  		var range = require('range').create(editor.getSelectionRange());
  		var info = require('editorUtils').outputInfo(editor);
  			
  		if (!range.length()) {
  			// no selection, find matching tag
  			var tag = require('htmlMatcher').tag(info.content, editor.getCaretPos());
  			if (tag) { // found pair
  				range = tag.outerRange;
  			}
  		}
  		
  		return genericCommentToggle(editor, '<!--', '-->', range);
  	}
docs: Toggle HTML comment on current selection or tag
  @param {IEmmetEditor} editor
  @return {Boolean} Returns <code>true</code> if comment was toggled