Project: less
Task (challenging): Class DataQuestion (file 'common/DataQuestion.js', 'common/DataQuestion.less') inherits from Question. Its constructor params are: title (string), name (string), preview (boolean), type (one of url/tel/email/date/number, as input element type). Add a button (class 'add-data') in 'common/SurveyDesign.js', and click it to create a DataQuestion (random title, unique name, random type) whose root is prepended to the form. Add a config panel select (class 'q-type', options url/tel/email/date/number) associated with 'DataQuestion.type'.