behavior-task-preview.js
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			/**
			* @provides javelin-behavior-maniphest-description-preview
			* @requires javelin-behavior
			* javelin-dom
			* javelin-util
			* phabricator-shaped-request
			*/

			JX.behavior('maniphest-description-preview', function(config) {

			var preview = JX.$(config.preview);
			var textarea = JX.$(config.textarea);

			var callback = function(r) {
			JX.DOM.setContent(JX.$(config.preview), JX.$H(r));
			};

			var getdata = function() {
			return {
			description : textarea.value
			};
			};

			var request = new JX.PhabricatorShapedRequest(config.uri, callback, getdata);
			var trigger = JX.bind(request, request.trigger);

			JX.DOM.listen(textarea, 'keydown', null, trigger);
			request.start();
			});

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