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cardquantity.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>card-quatity</title>
</head>
<body>
<button
onclick="
console.log(`card-quatity=${cardQuatity}`)
"
>
card-quatity
</button>
<button
onclick="
cardQuatity++;
console.log(`card-quatity=${cardQuatity}`)
"
>
add to cart
</button>
<button
onclick="
cardQuatity=cardQuatity +2;
console.log(`cardQuatity=${cardQuatity}`)"
>
+2
</button>
<button
onclick="
cardQuatity=cardQuatity +3;
console.log(`cardQuatity=${cardQuatity}`)"
>
+3
</button>
<button
onclick="
cardQuatity=0;
console.log('card was reset');
console.log(`cardQuatity=${cardQuatity}`)"
>
reset
</button>
<script>
let cardQuatity = 0;
</script>
</body>
</html>