only select one radio button code example

Example 1: radio buttons html

<input type="radio" name="gender" value="male"> Male<br>
<input type="radio" name="gender" value="female"> Female<br>
<input type="radio" name="gender" value="other"> Other

Example 2: html radio only one checked

<!--Just manke both names equal -->
<input type="radio" name="options" id="1"/>
<input type="radio" name="options" id="2"/>