Selection of Input[type="radio"] and Input[type="checkbox"]
1.1 Input[type="radio"] selected
<input type="radio"> multiple radio buttons are used at the same time. To form the effect of only radio selection, the name value must be the same, and a selected box should be used checked attribute.
Note: It should be written as <input type="radio" checked > instead of checked="true".
1.2 The selection of Input[type="checkbox"]
<input type="checkbox"> is a check box, which cannot form the effect of only single selection, even if the name value is the same. If you want to make it checked, use the checked attribute.