Reset buttons are never sent as part of the form's contents. Used for simple Boolean attributes, or for attributes that can take multiple values at the same time. The latter is represented by several checkbox fields with the same name and a different value attribute. Use the checked attribute to initialize the checkbox to its checked state. Each radio button field in the group should be given the same name .
Radio buttons require an explicit value attribute.
One radio button in each group should be initially checked using the checked attribute. This is used for graphical submit buttons rendered by an image rather than a text string. The URL for the image is specified with the src attribute. The image alignment can be specified with the align attribute. In this respect, graphical submit buttons are treated identically to IMG elements, so you can set align to left, right, top, middle or bottom.