i am teaching my self how to write code. for part of my project i will be using drop down menus but i am stuck. say you have 5 options and 2 actual drop down selectors (A and B). in A you select #3. my question is how, do you make it so #3 can not be selected for B?
<!DOCTYPE html>
<html>
<body>
<label for="option">Choose 2:</label>
<select id="cars">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<select id="cars">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</body>
</html>